Realise or Realize?

Realise and realize are different spellings of the same word, and they can be used interchangeably. Both are common throughout the English-speaking world, though in different areas. Realize is preferred in American and Canadian English, while realise is preferred outside North America.

You can find more details about these spelling differences below.

Realise or Realize? image

Realise or Realize—Which Should I Use?

People associate a lot of things with British culture—one of them is how different British English is from American English, spelling included. Let’s compare realise and realize.

Consider your audience. For American readers, the -ize ending is probably the way to go. While both endings might be correct according to your dictionary of choice, you could unnecessarily alienate your audience if you insist on using -ise. Elsewhere, preferences might not be as strong, but they might view -ize as an American spelling. What is important is that you are consistent. For example, if you decide to go with realize, you should use the -ize ending for all verbs that can be spelled with either -ize or -ise. By doing so, you will minimize the risk of someone thinking you’ve made a mistake.

The -ise ending is actually newer than the -ize ending. In Britain and other countries, it became popular after 1875, when it began appearing in news articles. However, the -ise ending didn’t catch on in the United States or in British science periodicals and professional journals. For that reason, you will see both verb endings in British literature.

Oxford University Press, a British publisher, prefer to use the -ize ending for words that derive from the Greek suffix -izo. Doing so reflects the origins of verbs and nouns, such as realization, organization, and privatization. An -ise ending could erroneously suggest that the verbs derive from the French verbs réaliser, organiser, or privatiser. That’s not to say that Oxford style always condemns -ise endings. To illustrate, the -ise of televise doesn’t have a Greek origin, so that -ise ending is A-okay.


People do not seem to realise that their opinion of the world is also a confession of their character.

We’re living in science fiction, but we don’t realize it.

Adding this up, Woolworths could realise up to $1bn on the sale.

Worse than not realizing the dreams of your youth would be to have been young and never dreamed at all.

Which do you prefer—realise or realize? Will you choose the spelling most popular where you live?

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  • Christopher in Portland

    I think that Grammarly should recognise(ize) that many of us live in two, or sometimes more, “worlds” and correspond with many people and cultures than just the one in which we live.

    Personally, I choose to use both endings; I have my English-family audience, to whom I wish to speak/write in “their” language…and my American family and friends, to whom I speak/write in American style. In addition, I often write in publications, answering questions and concerns regarding the English language and customs (Royal Family and such) in which it is more appropriate to write “English-English”, not American English.

    Grammarly constantly corrects me mid-stream, as it were, and I have to keep on choosing to “ignore” that suggested correction; then my weekly feed-back from Grammarly “dings” me for being both English and American in my language use. That’s unfair.

    Let me add my “English-English” words into a dictionary all the time, and not be restricted in my usage.

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