Both spellings are correct — "recognize" is American English, while "recognise" is British English (both forms are detailed in the Oxford Learner's Dictionaries, and the spelling is also used in Australia, Canada, and most Commonwealth countries). The choice depends entirely on which English convention you're writing in, not on grammar rules.
The Core Difference: -ize vs -ise
This isn't unique to "recognize" — it's part of a broader American vs. British spelling pattern (which also includes spelling splits like defence vs defense and license vs licence):
| American (-ize) | British (-ise) |
|---|---|
| recognize | recognise |
| organize | organise |
| realize | realise |
| apologize | apologise |
How to Choose Which to Use
- Writing for a US audience or US publication → use recognize
- Writing for a UK, Australian, or international audience → use recognise
- Writing for a global brand → pick one spelling and stay consistent throughout the document; mixing both looks like an error, even though both are individually correct
A Small Complication: British English Sometimes Allows "-ize" Too
Oxford English Dictionary style (used in some UK academic and publishing contexts) actually accepts "-ize" spellings as a valid British variant. In practice, though, "-ise" is far more common in everyday British writing, so it remains the safer default for a UK audience.
Frequently Asked Questions
Is "recognize" wrong in British English?
Not strictly wrong under Oxford spelling conventions, but "recognise" is the more commonly expected and recognized (see what we did there) form in everyday UK writing.
Does spell-check catch this automatically?
Only if your document's language setting is correctly set to UK or US English — otherwise spell-check may flag the "wrong" one incorrectly.
Which spelling should I use for SEO/global content?
If your audience is primarily American, use "recognize" — it has a slightly higher search volume in most English-language keyword tools and matches broader searcher expectations.
💡 The Takeaway
Neither spelling is wrong — pick the one that matches your audience's English convention, and stay consistent with it throughout the same piece of writing.
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