Both spellings are correct. Neither is a misspelling. The difference comes down to where you are — or more precisely, which variety of English you’re writing in.
Defense is the standard spelling in American English.
Defence is the standard spelling in British English — and is also used in Canada, Australia, and most other countries that follow British spelling conventions.
Defence or Defense Same Word, Two Spellings
Defence and defense mean exactly the same thing. The word refers to protection against attack, harm, or criticism. It covers a wide range of uses:
- A country’s military forces and systems (national defense / national defence)
- Legal representation in a court case (the defense rested its case / the defence rested its case)
- Protection in sport (the team’s defense was solid / the team’s defence was solid)
- A response to criticism or an argument (she spoke in defense of her decision / she spoke in defence of her decision)
The meaning never changes based on the spelling. Only the audience does.
Which Defence or Defense Spelling Should You Use?
The simplest rule: match your spelling to your reader.
- Writing for an American audience? Use defense.
- Writing for a British, Canadian, or Australian audience? Use defence.
- Writing for a mixed audience? Pick one and stay consistent throughout.
If you’re a student, check which variety of English your school or institution requires. If you’re writing professionally, follow the house style of whoever you’re writing for.
Why Do the Two Spellings Exist?
English spelling wasn’t fully standardized until the 18th and 19th centuries. American English was largely shaped by Noah Webster, whose 1828 dictionary deliberately simplified or Americanized a number of spellings — dropping the u from words like colour (→ color), changing -ise endings to -ize, and preferring -se endings like defense over -ce endings like defence.
British spelling retained the older -ce form, which had roots in Old French (defens and defence both appeared in Middle English texts). Over time, the two traditions simply developed along separate paths.
An Important Exception: The NFL
In American football, the word defense is universally spelled the American way — even in countries that normally use British spelling when they write about the sport. This is because American football itself is an American game, and its terminology travels with its original spelling.
So if you’re writing about an NFL team’s defensive strategy, defense is correct regardless of where you’re publishing.
Defensive, Defensible, Defenceless?
The spelling split doesn’t carry through to every related word.
- Defensive is spelled the same way in both American and British English — always with an s.
- Defensible is also the same in both varieties.
- Defenceless (British) vs defenseless (American) — this one does follow the split.
- Indefensible is spelled the same everywhere.
So while defence and defense split cleanly between the two varieties, the adjective defensive does not. British writers use defensive just as American writers do.
Quick Reference
| Context | American English | British/Commonwealth English |
| Military protection | defense | defence |
| Legal team | the defense | the defence |
| Sports protection | defense | defence |
| Adjective | defensive | defensive |
| Unable to be defended | indefensible | indefensible |
| Without protection | defenseless | defenceless |
Common Mistakes
The only real mistake is mixing the two spellings within the same document — writing defence in one paragraph and defense in another. Pick one and stay consistent.
British writers sometimes second-guess themselves and switch to the American spelling, assuming it looks more “official” or “modern.” It doesn’t. Defence is fully correct in British English and is the expected form in formal British writing, including government and legal documents.
Both spellings are well established, widely used, and entirely correct. Choose based on your audience, stay consistent, and you won’t go wrong with either.
Read more:
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It’s Afini, I am the author at Vocab press, a website focused on animal facts with clear visuals and simple guides. I research and share accurate, easy-to-understand information for readers of all ages. My goal is to make learning about animals fun, trustworthy, and simple. I follow fact-based writing and keep content updated, helpful, and people-first. Thank you for reading.
