Memorise vs Memorize

Quick Answer

The fastest way to know which spelling to use.

The difference between memorize and memorise comes down entirely to geography.

If you are writing for an audience in the United States, the correct spelling is memorize (with a 'z'). If you are writing for an audience in the United Kingdom, Australia, or New Zealand, the correct spelling is memorise (with an 's').

Both words refer to the exact same thing: committing something to memory or learning it by heart. Neither spelling is grammatically incorrect, but using the wrong one for your target region can look out of place.

Memorise vs Memorize at a Glance

A side-by-side breakdown of the key differences.

Feature	Airplane (US)	Aeroplane (UK)
Standard Region	United States	United Kingdom
Spelling	M-E-M-O-R-I-Z-E	M-E-M-O-R-I-S-E
Syllable Count	4 (MEM-uh-rise)	4 (MEM-uh-rise)
Origin	Greek root (-ize)	French influence (-ise)
Meaning	To commit to memory	To commit to memory

American English: Memorize

How the word is used in the United States.

In the United States, "memorize" is the universally accepted spelling. It uses the "z" suffix, reflecting the Greek origins of the '-ize' verb ending. It is used by American schools, publishers, and everyday speakers.

Educational Standard

American schools and educational publishers exclusively use the "memorize" spelling in textbooks and curricula.

Media and Publishing

Major American publications and style guides, like the AP Stylebook, follow the "memorize" spelling without exception.

British English: Memorise

How the word is used in the United Kingdom.

In the United Kingdom, "memorise" is the standard spelling in everyday use. It retains the "s" suffix, a hallmark of British English spelling conventions heavily influenced by Old French. While Oxford spelling uses 'z', standard British public usage is 's'.

Educational Standard

British schools teach students to spell the word as "memorise," and national exams require the 's' suffix.

Modern Usage

Though some academic institutions (like Oxford) historically use 'z', the general public and mainstream media rely on "memorise."

What Do Both Words Mean?

The definition remains exactly the same.

Despite the spelling difference, both "memorize" and "memorise" mean exactly the same thing. They refer to the process of committing information to memory so that you can recall it later.

Core Definition

To learn by heart, or to commit to memory so that something can be recalled without conscious thought.

Not Just Recitation

It applies to facts, lines, songs, speeches, and physical muscle memory.

American English Usage

How Americans naturally use the word today.

In the US, "memorize" is used in almost every context, from casual conversation to technical educational writing. It applies to schoolwork, acting, music, and general learning.

School Context

"The students were asked to memorize the preamble to the Constitution."

Technical Writing

"The software requires users to memorize a complex sequence of passwords."

Everyday Life

"I can't memorize all these names before the party."

Music & Arts

"The actor had to memorize his lines in three days."

British English Usage

How Britons naturally use the word today.

In the UK, "memorise" holds its ground in education, formal writing, and everyday contexts. It is the expected spelling for all forms of learning and memory retention.

Literature and Media

"The child was able to memorise the alphabet before starting school."

Everyday Conversation

"I can't seem to memorise my next-door neighbour's phone number."

Academic Contexts

"The exam requires you to memorise a series of historical dates."

News and Journalism

"The minister managed to memorise his entire speech without notes."

Which Spelling Should You Use?

Deciding based on your audience.

The decision is entirely context-driven. If you are writing an email to an American colleague, use "memorize." If you are writing a postcard from London to your friends back in Britain, use "memorise."

Choose "Memorize" if:

You are writing for a US-based publisher, studying at an American school, or creating content primarily for an American audience.

Choose "Memorise" if:

You are submitting to a UK journal, writing for a British audience, or following Commonwealth English standards.

Formal and Professional Writing

What to do in business and academic contexts.

In highly formal academic writing, the safest approach is to match the regional standard of your publisher. Be aware that Oxford University Press uses '-ize' (memorize), but most other UK publishers use '-ise' (memorise).

Business Contracts

International training manuals often use "commit to memory" to prevent ambiguity between American and British stakeholders.

Academic Research

Scientific papers regarding cognitive psychology use "memorize" in US journals, and usually "memorise" in standard UK journals.

Pronunciation

The spelling change does not alter the spoken word.

The spelling difference does not change the spoken word at all; both are pronounced with the same number of syllables and stress pattern.

Word	IPA	Syllables
Airplane (US)	/ˈmɛm.ə.raɪz/	4 (MEM-uh-rise)
Aeroplane (UK)	/ˈmɛm.ə.raɪz/	4 (MEM-uh-rise)

In both American and British English, the word is pronounced with four distinct beats (MEM-uh-rise). The 's' in the British spelling and the 'z' in the American spelling produce the exact same 'z' sound in spoken English.

Spelling Difference

A visual breakdown of the letters.

The core difference is the final letter of the word.

Memorize

Memorise

The American version uses a "z" (memorize), while the British version uses an "s" (memorise). Both endings produce the same 'z' sound, but the American spelling aligns with the Greek 'izo' root, while the British spelling aligns with French influence.

Why Are the Spellings Different?

The history behind the transatlantic split.

1. The Greek and Latin Roots

The word comes from the Latin 'memoria' (memory) and ultimately the Greek 'mnasthai' (to remember). Early English adopted it from the Old French 'memoriser', which used the 's'.

2. Noah Webster's Reform

In 1828, Noah Webster preferred the '-ize' ending to reflect the original Greek root 'izo'. This cemented 'memorize' as the standard American spelling, distinct from British conventions.

3. The Oxford vs Public Standard

Interestingly, the Oxford English Dictionary historically preferred '-ize' endings (Oxford spelling). However, the British public largely adopted the French '-ise' endings, making 'memorise' the standard UK spelling in everyday use.

Synonyms, Antonyms & Rhyming Words

Words related to, opposite of, and sounding like memorize/memorise.

Synonyms (Similar Meaning)

Antonyms (Opposite Meaning)

Rhyming Words (Sound Matches)

Learn More Rhyming Words

Example Sentences

See how both words function in original sentences.

Here are 30 original sentences using the American spelling, "memorize."

I need to memorize my lines for the school play.
She managed to memorize the entire periodic table.
It takes hours to memorize a complex piece of music.
The actor was told to memorize the script before Friday.
He couldn't memorize the PIN for his new debit card.
The teacher asked the class to memorize the state capitals.
To learn a new language, you have to memorize a lot of vocabulary.
I can't memorize all these dance moves in one rehearsal.
The doctor had to memorize the anatomy of the human hand.
She tried to memorize the directions but got lost anyway.
It is impossible to memorize every single rule in the handbook.
The choir director wants us to memorize the lyrics by Sunday.
He tried to memorize the speech word for word.
You don't have to memorize the formula; it's on the cheat sheet.
The game requires players to memorize the sequence of colors.
I can't memorize numbers as easily as I used to.
She used a mnemonic device to memorize the password.
The professor refused to let students memorize without understanding.
It took him years to memorize the entire chess board.
You must memorize the safety protocols before starting the job.
She would rather memorize a poem than write an essay.
It is hard to memorize a song in a foreign language.
The training program forces you to memorize the flight manual.
He didn't bother to memorize the dates for the history exam.
Let's memorize the chorus first and tackle the verses later.
It is often better to understand than to memorize facts.
The dog was able to memorize the obstacle course.
She had to memorize the layout of the building for the fire drill.
I can't memorize my own phone number sometimes.
They were asked to memorize the preamble to the Constitution.

Here are 30 original sentences using the British spelling, "memorise."

I need to memorise my lines for the school play.
She managed to memorise the entire periodic table.
It takes hours to memorise a complex piece of music.
The actor was told to memorise the script before Friday.
He couldn't memorise the PIN for his new debit card.
The teacher asked the class to memorise the capital cities.
To learn a new language, you have to memorise a lot of vocabulary.
I can't memorise all these dance moves in one rehearsal.
The doctor had to memorise the anatomy of the human hand.
She tried to memorise the directions but got lost anyway.
It is impossible to memorise every single rule in the handbook.
The choir director wants us to memorise the lyrics by Sunday.
He tried to memorise the speech word for word.
You don't have to memorise the formula; it's on the cheat sheet.
The game requires players to memorise the sequence of colours.
I can't memorise numbers as easily as I used to.
She used a mnemonic device to memorise the password.
The professor refused to let students memorise without understanding.
It took him years to memorise the entire chess board.
You must memorise the safety protocols before starting the job.
She would rather memorise a poem than write an essay.
It is hard to memorise a song in a foreign language.
The training programme forces you to memorise the flight manual.
He didn't bother to memorise the dates for the history exam.
Let's memorise the chorus first and tackle the verses later.
It is often better to understand than to memorise facts.
The dog was able to memorise the obstacle course.
She had to memorise the layout of the building for the fire drill.
I can't memorise my own phone number sometimes.
They were asked to memorise the national anthem.

Memorize in US English

Specific contexts, industry standards, and cultural data for the American spelling.

In the United States, "memorize" is the standard spelling in education, literature, and media. American schools, dictionaries, and publishers favor this phonetic, Greek-aligned spelling.

Educational Standard

American schools and textbooks exclusively use "memorize." It is the only spelling taught in the US education system for committing facts to memory.

Academic & Publishing

In American academic writing, "memorize" is the only accepted spelling. The Chicago Manual of Style and AP Stylebook mandate the '-ize' ending.

Cognitive & Science Context

American psychology papers use "memorize" when discussing memory retention, rehearsal, and cognitive load tasks.

Common American Phrases

• Memorize lines: Learning an acting script.
• Memorize facts: Studying for a test.
• Memorize the rules: Learning a game.
• Memorize the password: Security practices.

Memorise in UK English

Specific contexts, industry standards, and cultural data for the British spelling.

In the UK, "memorise" is the standard spelling for general public, media, and educational contexts. British style guides and dictionaries strictly maintain the French-derived "-ise" suffix.

Educational Standard

British schools teach students to spell the word as "memorise." It is the required spelling for GCSE and A-level exams.

Academic & Publishing

While Oxford University Press traditionally uses '-ize' (Oxford spelling), the vast majority of UK publishers, newspapers, and universities use "memorise."

Cognitive & Science Context

British psychology and neuroscience literature typically use "memorise" when describing memory encoding and recall.

Common British Phrases

• Memorise lines: Learning an acting script.
• Memorise facts: Studying for an exam.
• Memorise the rules: Learning a game.
• Memorise the password: Security practices.

Related Verb Spelling Differences

Other words that differ with the ize/ise rule.

US English	UK English	Meaning
Organize	Organise	To arrange or structure something.
Realize	Realise	To become aware of something.
Recognize	Recognise	To identify someone or something.
Analyze	Analyse	To examine in detail.

Other US–UK Spelling Differences

More words that change when you cross the pond.

Color vs. Colour

Americans use "color" for the visual property, while Britons use "colour."

Center vs. Centre

The US uses "center" for a midpoint, while the UK uses "centre."

Labor vs. Labour

American English spells it "labor," while British English uses "labour."

Catalog vs. Catalogue

The US prefers "catalog," while the UK often uses "catalogue."

Common Mistakes

Frequent errors writers make with these spellings.

Mixing spellings within the same document.

✓ Pick one regional standard and stick to it.

Why: Writing "I need to memorize the lines for the memorise task" confuses the reader and breaks the consistency of your text.

Using "memorise" in an American academic paper.

✓ Use "memorize" for US-based journals and schools.

Why: American professors and publishers expect standard American English. Using the British spelling looks like a typo in this context.

Using "memorize" in a British primary school.

✓ Use "memorise" for UK audiences.

Why: British educators strictly enforce traditional spelling standards, especially in educational materials for kids.

Mispronouncing "memorise" with a harsh 's' sound (like in "sip").

✓ Pronounce it with a 'z' sound: "MEM-uh-rise."

Why: The 's' in the British spelling does not change the pronunciation. It is pronounced exactly like the American 'z'.

Assuming "memorize" and "memorise" have different meanings.

✓ Recognize that they are entirely the same word.

Why: Whether referring to studying, muscle memory, or acting, the meaning is identical; only the regional spelling differs.

Hyphenating the words ("memori-se").

✓ Always use a single, unhyphenated word.

Why: While early texts sometimes had different conventions, modern English treats both forms as solid compound words.

Forgetting that Canada leans British for this word.

✓ Use "memorise" for Canadian audiences, though "memorize" is understood.

Why: Despite proximity to the US, Canadian English heavily favors British spellings for '-ize' vs '-ise' words.

Assuming the 'z' is harsh in American English.

✓ Pronounce the American 'z' exactly like the British 's'.

Why: The 'z' and 's' produce the same voiced consonant sound in this context. Neither is sharper or harsher than the other.

Confusing the verb with the noun (memory).

✓ Keep "memorize/memorise" (verb) separate from "memory" (noun).

Why: You commit something to memory by memorizing it. The action is the verb, the storage is the noun.

Assuming Oxford spelling represents the whole UK.

✓ Recognize that standard UK public usage is "memorise."

Why: While Oxford dictionaries use '-ize', the general British public and mainstream media use "memorise."

Writing for an International Audience

How to handle the split when writing globally.

If you are writing a blog, book, or manual for a global audience, you must pick a primary English standard. Most international organizations choose either US or UK English as their default and stick to it.

Pro Tip: Because American media and tech dominate globally, many ESL learners are more familiar with "memorize." However, if your organization is based in Europe or the Commonwealth, "memorise" is the expected standard.

Memory Tip

An easy way to remember which spelling belongs to which country.

If you struggle to remember the difference, use this simple association trick:

America = Memorize

School in the UK = Memorise

Notice the "z." America uses a "z" in "memorize." Notice the "s." UK schools teach the "s" in "memorise."

🎮 Mini Quiz

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Frequently Asked Questions

Quick answers to common questions.

Are 'memorize' and 'memorise' pronounced the same way?

Yes, they are pronounced exactly the same way. Both are pronounced with four syllables (MEM-uh-rise). The 's' in the British spelling is pronounced as a 'z', identical to the American spelling.

Why does America use 'memorize' instead of 'memorise'?

In the early 19th century, American lexicographer Noah Webster sought to simplify American spelling. He preferred the '-ize' ending because it aligned with the original Greek root 'izo', distinguishing American English from British conventions.

Is 'memorise' ever used in the United States?

It is very rare in modern American English. You might occasionally see it in texts published by Oxford University Press in the US, but 'memorize' is the undisputed standard in America today.

What about Canada and Australia? Which spelling do they use?

Canada generally follows the British spelling ('memorise'), though American spelling is also widely understood. Australia and New Zealand follow British English and use 'memorise'.

Does Oxford University use 'memorize' in the UK?

Yes, Oxford University Press and a few academic institutions use 'Oxford spelling', which mandates the '-ize' ending. However, the general British public and mainstream media use 'memorise'.

Which spelling is older, 'memorize' or 'memorise'?

The '-ize' spelling is technically older, reflecting the Greek root. However, the '-ise' spelling became standard in British English over centuries due to the heavy influence of Old French.

Should I use 'memorize' or 'memorise' in academic writing?

You should match the spelling to the regional standard of your audience or publisher. If you are writing for an American journal, use 'memorize'. For a British or international European journal, 'memorise' is preferred.

What is the word 'memorise' derived from?

The word comes from the Latin word 'memoria', which means 'memory'. It entered English through the Old French word 'memoriser'.

Are there other words that follow this 'ize' vs 'ise' pattern?

Yes, this is a very common pattern. Other examples include 'organize/organise', 'realize/realise', 'recognize/recognise', and 'analyze/analyse' (though analyse uses a different vowel).

Which word is more commonly used globally today?

Because of the dominance of the American tech industry, media, and educational software, 'memorize' is recognized globally. However, 'memorise' remains the correct standard spelling in formal British, Australian, and New Zealand English.