When you want to talk about learning something so well that you can remember it without help, you may wonder whether to write memorize or memorise. The difference between Memorize vs Memorise is mainly a matter of spelling conventions, with the correct choice depending on the type of English and the country where the word is being used.
Memorize and memorise have the same meaning. Both mean to learn something by heart so that you can remember and recall it later. Memorize is the standard spelling in American English, while memorise is the traditional spelling in British English and many other varieties that follow British spelling conventions.
Examples:
- Students need to memorize the formulas before the exam.
- Students need to memorise the formulas before the exam.
The confusion is understandable. People often search for memorize vs memorise, memorize or memorise, which spelling is correct, or memorise meaning in English because both spellings are accepted, yet they follow different spelling conventions. And here’s the kicker: neither spelling changes the word’s meaning or pronunciation.
In this guide, you’ll learn the complete difference between Memorize vs Memorise, including their meaning, pronunciation, origin, correct spelling, and usage. You’ll also discover which spelling to use in American English vs British English, along with clear examples to help you choose the right form.
Memorize vs Memorise: Quick Answer
The simplest way to remember the difference is this:
| Spelling | English variety | Meaning | Example |
| memorize | American English | Learn something so you can remember it | I need to memorize these words. |
| memorise | British English | Learn something so you can remember it | I need to memorise these words. |
Cambridge lists memorize as the main entry and notes that UK English usually uses memorise. Oxford similarly lists memorize and identifies memorise as the British English form.
Merriam Webster goes a step further by defining memorise as the British spelling of memorize.
The rule in one line
US English: memorize
UK English: memorise
That’s the main distinction.
What Does Memorize Mean?
Memorize is a verb that means to learn something so that you can remember it exactly. You might memorize a poem, speech, phone number, formula, address, name, set of instructions, or other information.
For example:
- I need to memorize this poem before Friday.
- She memorized the entire speech.
- The students are memorizing vocabulary words.
- He tried to memorize the route to the station.
- You should memorize your emergency contact number.
Cambridge defines memorize as learning something so that you will remember it exactly. Merriam Webster gives a closely related definition: “commit to memory” or “learn by heart.”
The word often describes deliberate learning. If you simply remember something from experience, you don’t necessarily memorize it. Memorization usually involves intentionally putting information into your memory.
Examples of memorize
Here are some natural examples:
School
Students had to memorize the multiplication tables.
Public speaking
The actor spent several hours trying to memorize her lines.
Languages
I used flashcards to memorize new vocabulary.
Travel
Before the trip, he memorized the address of the hotel.
Everyday life
She quickly memorized everyone’s names at the meeting.
Oxford also gives examples involving memorizing poems, verbs, details, and other information.
What Does Memorise Mean?
Memorise has the same meaning as memorize. It means to learn something so that you can remember it, often exactly.
The only major difference is the spelling.
For example:
- I need to memorise this poem.
- She memorised her presentation.
- The children are memorising new words.
- He tried to memorise the instructions.
- We had to memorise several formulas.
Merriam Webster specifically describes memorise as the British spelling of memorize.
Examples of memorise
School
The pupils had to memorise the poem.
Work
She memorised the presentation before the meeting.
Language learning
He uses flashcards to memorise new vocabulary.
Performance
The actors spent the afternoon memorising their lines.
Notice something important: none of these sentences has a different meaning from its American English counterpart. The spelling changes, but the idea stays exactly the same.
Memorize vs Memorise: What Is the Main Difference?
The main difference between memorize and memorise is regional spelling.
American English generally prefers -ize in this word:
memorize
British English commonly uses -ise:
memorise
This difference doesn’t create two separate meanings. It also doesn’t normally create two different pronunciations.
| Feature | Memorize | Memorise |
| Meaning | Learn something so you remember it | Learn something so you remember it |
| Main spelling convention | American English | British English |
| Ending | -ize | -ise |
| Pronunciation | Same | Same |
| Past tense | memorized | memorised |
| Present participle | memorizing | memorising |
Cambridge gives the same pronunciation for the two spellings, while Oxford also lists the same pronunciation for memorize and identifies memorise as the British form.
In other words, the z versus s difference is primarily visible on the page rather than something you normally hear.
Is Memorize or Memorise Correct?
Both are correct.
The correct choice depends on the English variety you’re following.
If you’re writing in American English, use:
memorize
If you’re writing in British English, use:
memorise
Neither spelling is inherently wrong.
For example, an American school assignment might say:
Students must memorize the first 20 vocabulary words.
A British school assignment could say:
Students must memorise the first 20 vocabulary words.
Both sentences communicate the same idea.
Why do both spellings exist?
English has several regional spelling differences. The -ize / -ise pattern appears in many words, which is why learners often encounter both forms.
Consider these pairs:
| American English | British English |
| organize | organise |
| recognize | recognise |
| realize | realise |
| apologize | apologise |
| memorize | memorise |
However, don’t assume that every English word containing -ize automatically has a British -ise equivalent. English spelling has many exceptions and historical patterns. Treat each word according to the accepted spelling conventions rather than applying a rule blindly.
Memorize in American English
Memorize is the spelling to choose when you’re following standard American English.
American dictionaries use forms such as:
- memorize
- memorizes
- memorized
- memorizing
- memorization
Cambridge’s American English dictionary lists memorize, memorizing, and memorized. Oxford’s American English dictionary also gives memorize as the standard form.
American English examples
- I need to memorize these definitions.
- She memorized her lines before opening night.
- He is memorizing the new vocabulary.
- We had to memorize the safety instructions.
- The student memorized the formula.
- Try to memorize the phone number.
If your article, essay, website, or report otherwise uses American spelling, memorize will usually be the better choice.
Memorise in British English
Memorise is the usual British spelling.
British English commonly uses:
- memorise
- memorises
- memorised
- memorising
- memorisation
Cambridge identifies memorise as the usual UK spelling of memorize, while Merriam Webster labels memorise as the British spelling.
British English examples
- I need to memorise these definitions.
- She memorised her lines before opening night.
- He is memorising the new vocabulary.
- We had to memorise the safety instructions.
- The student memorised the formula.
- Try to memorise the phone number.
Again, the meaning hasn’t changed. Only the regional spelling has.
Memorize vs Memorise in Other English Varieties
The distinction becomes slightly more interesting when you write for an international audience.
English exists in many regional varieties, including American, British, Canadian, Australian, and other established forms. Spelling preferences can vary across these varieties and across individual publications.
The safest approach isn’t to memorize a giant list of country rules. Instead, follow the style standard required by your audience or publication.
For example:
- A US publication will generally favor memorize.
- A British publication will generally favor memorise.
- A company with an established house style should follow that style.
- An academic institution may specify which English variety students should use.
- A publisher may have its own editorial guidelines.
Consistency matters more than switching forms
Imagine an article that begins with:
Students should memorize important terms.
Later, it says:
Learners should memorise the definitions.
The reader can understand both sentences. Still, the mixed spelling makes the article look inconsistent.
A cleaner version would use one convention throughout:
Students should memorize important terms.
Learners should memorize the definitions.
Or:
Students should memorise important terms.
Learners should memorise the definitions.
That’s especially important in formal writing.
Memorize vs Memorise: Verb Forms
The spelling difference continues when you change the form of the verb.
| Verb form | American English | British English |
| Base form | memorize | memorise |
| Third person singular | memorizes | memorises |
| Past tense | memorized | memorised |
| Past participle | memorized | memorised |
| Present participle | memorizing | memorising |
Oxford lists the American forms memorize, memorizes, memorized, and memorizing, while Cambridge gives the corresponding American forms and identifies the British memorise spelling.
Memorize vs memorise
I need to memorize the words.
I need to memorise the words.
Memorizes vs memorises
She memorizes new vocabulary quickly.
She memorises new vocabulary quickly.
Memorized vs memorised
He memorized the entire speech.
He memorised the entire speech.
Memorizing vs memorising
They are memorizing the names.
They are memorising the names.
The pattern is straightforward: American English keeps the z, while the common British form uses s.
Memorize vs Memorise: Pronunciation
Despite the spelling difference, memorize and memorise are normally pronounced the same way.
Cambridge gives the pronunciation as /ˈmem.ə.raɪz/ for both its US and UK entries.
Oxford also lists /ˈmeməraɪz/ for memorize.
So you don’t need to pronounce the British spelling differently simply because it contains an s.
Think of it as a spelling switch rather than a sound switch.
A useful pronunciation point
The ending sounds like “ize” rather than a simple “iss” sound.
The word can be broken roughly into:
mem + uh + rize
The exact sound varies slightly with accent, but the US and UK forms don’t normally create a meaningful pronunciation contrast.
Memorize vs Memorise Examples in Sentences
Seeing the two forms side by side makes the distinction much easier.
| American English | British English |
| I need to memorize this poem. | I need to memorise this poem. |
| She memorized the speech. | She memorised the speech. |
| He is memorizing the vocabulary. | He is memorising the vocabulary. |
| They memorize important dates. | They memorise important dates. |
| The actor memorized his lines. | The actor memorised his lines. |
| We had to memorize the formula. | We had to memorise the formula. |
| She memorizes names easily. | She memorises names easily. |
The table reveals the key point: the grammar and meaning remain unchanged. Only the spelling convention changes.
Memorize vs Memorise in Academic Writing
Academic writing often makes spelling consistency especially important.
Suppose you’re writing a research paper for a US university. If the rest of your paper uses American spellings such as color, behavior, and organize, then memorize fits that system.
On the other hand, if you’re writing for a British institution that follows British English, memorise will generally fit better.
What should students do?
Before submitting academic work, check:
- Your university’s language requirements.
- Your instructor’s preferred English variety.
- The required style guide.
- The spelling conventions used throughout your paper.
- Whether quotations need to preserve the original spelling.
The goal isn’t to prove that one form is “more correct.” The goal is to follow the required variety consistently.
Memorize vs Memorise in Professional Writing
Professional writing follows the same basic principle.
If a US company publishes an employee handbook, it might say:
Employees should memorize the emergency procedure.
A British company might write:
Employees should memorise the emergency procedure.
Neither company has made a grammatical mistake.
The important thing is that the organization’s spelling style remains consistent across:
- Reports
- Websites
- Training materials
- Emails
- Manuals
- Presentations
- Internal documents
- Marketing content
A consistent style makes professional communication look deliberate and polished.
Memorize vs Memorise: Common Mistakes
The biggest mistakes usually involve mixing spelling systems, not misunderstanding the word itself.
Mixing memorize and memorise
Using both forms in the same document can create unnecessary inconsistency.
Inconsistent:
Students should memorize the terms and memorise the definitions.
Consistent American English:
Students should memorize the terms and memorize the definitions.
Consistent British English:
Students should memorise the terms and memorise the definitions.
Assuming one spelling is wrong
Another common mistake is believing that memorise is simply a misspelling of memorize.
It isn’t.
Merriam Webster explicitly identifies memorise as the British spelling of memorize.
Changing the pronunciation
The spelling difference doesn’t mean you need to invent a different pronunciation.
Both forms are generally pronounced the same way.
Applying the -ize/-ise pattern blindly
It’s tempting to think that every word ending in -ize must become -ise in British English. English spelling isn’t that simple.
Some words have established forms that don’t follow a neat US-versus-UK conversion. That’s why a dictionary or style guide remains useful when you’re unsure.
How to Choose Between Memorize and Memorise
Choosing the right spelling takes only a few seconds.
Writing for an American audience?
Use memorize.
The students must memorize the vocabulary before Friday.
Writing for a British audience?
Use memorise.
The students must memorise the vocabulary before Friday.
Following a style guide?
Use whichever spelling that guide requires.
A publisher’s house style can override your personal preference.
Writing for an international audience?
Choose one English variety and stay consistent.
There’s usually no benefit in switching between memorize and memorise simply because different readers may recognize both.
Quick decision guide
Which spelling should you use?
|
+————+————+
| |
American English British English
| |
MEMORIZE MEMORISE
| |
memorized memorised
| |
memorizing memorising
This simple pattern covers the forms most writers encounter.
Memorize vs Memorise: Related Spelling Patterns
The memorize/memorise distinction belongs to a broader group of spelling differences involving -ize and -ise.
Here are some familiar examples:
| American English | British English |
| organize | organise |
| recognize | recognise |
| realize | realise |
| apologize | apologise |
| memorize | memorise |
For instance:
The teacher asked students to memorize the rules.
British English:
The teacher asked students to memorise the rules.
Similarly:
The manager will organize the meeting.
British English:
The manager will organise the meeting.
However, these patterns shouldn’t be treated as a universal spelling formula. Individual words have their own histories and dictionary conventions.
Memorization vs Memorisation
The noun follows the same regional spelling pattern.
Memorization is the common American English form.
Memorisation is the common British English form.
Cambridge lists memorization and notes that UK English usually uses memorisation.
Merriam Webster defines memorization as the act or process of memorizing something.
Examples
American English:
The course requires a lot of memorization.
British English:
The course requires a lot of memorisation.
Again, the difference is spelling rather than meaning.
Memorize vs Memorise: A Practical Case Study
Consider two versions of the same school policy.
Version A: American English
Students should memorize the key vocabulary before the examination. They will be tested on their ability to recall the terms accurately.
This version works naturally for a US audience.
Version B: British English
Students should memorise the key vocabulary before the examination. They will be tested on their ability to recall the terms accurately.
This version fits British spelling conventions.
What actually changed?
Only the spelling of the verb changed.
The:
- Meaning
- Grammar
- Sentence structure
- Pronunciation
- Intended action
all remain the same.
That’s why memorize vs memorise isn’t a vocabulary distinction. It’s primarily a regional spelling distinction.
A Closer Look at the Meaning of Memorize
Although the spelling question is simple, the meaning of memorize deserves a little attention.
To memorize something means to intentionally learn it so that you can recall it later. It often suggests that the information becomes available from memory without needing to look at the original source.
For example:
Maya memorized her presentation before the conference.
This tells us that Maya learned the presentation well enough to deliver it from memory.
By contrast:
Maya read her presentation before the conference.
This doesn’t tell us that she learned it by heart.
Similarly:
I remembered his name.
doesn’t necessarily mean:
I memorized his name.
The second statement suggests deliberate learning or committing the information to memory.
Merriam Webster gives learn by heart and commit to memory as synonyms or close equivalents.
Memorize vs Remember: Are They the Same?
Not quite.
Remember is broader.
You can remember something without deliberately memorizing it.
For example:
I remember my first day at school.
You probably didn’t sit down and intentionally memorize every detail of that day.
Memorize, however, usually suggests deliberate effort:
I memorized the first paragraph of the speech.
You intentionally learned the words so you could reproduce them later.
This distinction helps explain why dictionaries describe memorize in terms of learning something so that you can remember it exactly.
Memorize vs Learn by Heart
Learn by heart is another phrase with a very similar meaning.
For example:
She memorized the poem.
and:
She learned the poem by heart.
Both sentences tell us that she learned the poem well enough to recall it without reading it.
The expression learn by heart is especially common in British English, although American English speakers understand it as well.
Other useful alternatives include:
- commit to memory
- learn
- retain
- remember
- commit something to memory
The best choice depends on the exact context.
Why Spelling Consistency Matters
Spelling differences may seem tiny, but they can reveal which English variety a writer is following.
Imagine reading a page that uses:
organize, color, behavior, and memorize
The spelling clearly leans toward American English.
Now compare:
organise, colour, behaviour, and memorise
That pattern clearly follows British conventions.
Neither set is inherently superior. The problem appears when a writer mixes the two without a reason.
A simple rule for writers
Pick your English variety before you start writing and stick with it.
That one habit prevents many unnecessary spelling inconsistencies.
Memorize vs Memorise: Facts at a Glance
Here are the key facts in one place:
- Memorize is the standard American spelling.
- Memorise is the usual British spelling.
- Both words mean to learn something so that you can remember it.
- Both forms are pronounced essentially the same.
- Memorized is the American past tense.
- Memorised is the British past tense.
- Memorizing is the American present participle.
- Memorising is the British present participle.
- Memorization is the common American noun.
- Memorisation is the common British noun.
- Major dictionaries recognize the relationship between the two forms.
Frequently Asked Questions About Memorize vs Memorise
Is memorize American or British?
Memorize is the standard American spelling. British English also recognizes the word, but memorise is usually preferred in British usage. Cambridge explicitly marks memorise as the usual UK form.
Is memorise British or American?
Memorise is the usual British spelling of memorize. Merriam Webster specifically labels it the British spelling.
Do memorize and memorise mean the same thing?
Yes. Both mean to learn something so that you can remember it, often exactly.
Is memorise spelled with an S or Z?
Memorise is spelled with s.
Memorize is spelled with z.
Is memorize correct in British English?
Yes. British dictionaries recognize memorize, although memorise is generally the usual British spelling. Oxford lists memorize and notes memorise as the British English form.
Is memorise correct in American English?
It can be understood, but memorize is the standard spelling to use when following American English conventions.
Is memorizing or memorising correct?
Both are correct.
- memorizing = American English
- memorising = British English
Cambridge lists memorizing as the present participle of memorize.
Is memorized or memorised correct?
Both are correct.
- memorized = American English
- memorised = British English
Are memorize and memorise pronounced differently?
Generally, no. Cambridge gives the same pronunciation for the two forms.
Which spelling should I use in an American article?
Use memorize and its related forms, such as memorized, memorizing, and memorization.
Which spelling should I use in a British article?
Use memorise and related forms such as memorised, memorising, and memorisation.
Should I use memorize or memorise in academic writing?
Use the spelling required by your university, instructor, publisher, or style guide. If no specific requirement exists, choose one English variety and use it consistently.
Memorize vs Memorise: Final Verdict
The answer is simple: both memorize and memorise are correct.
The difference is mainly regional:
Memorize = American English
Memorise = British English
Both forms mean to learn something so that you can remember it. They normally have the same pronunciation, and neither form has a different meaning. Cambridge, Oxford, and Merriam Webster all support the relationship between the two spellings.
If you’re writing for readers in the United States, choose memorize. If you’re following British English, choose memorise. Most importantly, don’t switch between the two forms without a reason.
When in doubt, match the spelling to your audience and stay consistent.
