Both spellings are correct — "defense" is the American English spelling according to the Merriam-Webster Dictionary, while "defence" is the British English spelling (also standard in Canada, Australia, New Zealand, and most Commonwealth countries). Neither is "more correct" grammatically; the choice depends entirely on which English convention your audience expects.
The Pattern Behind -ce vs. -se
This spelling difference isn't unique to "defense" — it reflects a broader American/British pattern involving several everyday words that split the same way. If you want to explore more transatlantic vocabulary distinctions, read our guide on enquire vs. inquire.
| American (-se) | British (-ce) |
|---|---|
| defense | defence |
| offense | offence |
| license (verb & noun in US) | licence (noun) / license (verb) in UK |
| pretense | pretence |
For a detailed look at how this split affects licensing terms, check out our guide on license or licence. Interestingly, this pattern doesn't apply universally — words like "sense" and "expense" are spelled identically on both sides of the Atlantic, so the rule only applies to this specific cluster of related words, not to every word ending in that sound.
How to Choose the Right Spelling
- Writing for a US audience → use "defense"
- Writing for a UK, Australian, Canadian, or international audience → use "defence"
- Writing for a global brand with mixed audiences → pick one and remain consistent site-wide; switching between both within the same piece reads as an error
A Common Point of Confusion: Canada
Canadian English typically follows British spelling for "defence," but leans American for many other words (like "organize" instead of "organise"). This inconsistency is normal — Canadian English is a genuine hybrid shaped by both British colonial history and geographic/cultural proximity to the US.
Both "defense" and "defence" are pronounced identically, with stress on the second syllable (de-FENSE). The difference is purely written, which is part of why it causes so much confusion.
Where You'll See Each Spelling in Practice
"Defense" (American) appears in: US legal documents, American sports commentary (NFL, NBA, MLB), the US Department of Defense, and software built primarily for a US market.
"Defence" (British) appears in: UK, Australian, and Canadian government documents, international sports coverage from British/Commonwealth outlets, the UK Ministry of Defence, and content localized for British, Australian, Indian, or South African audiences.
Frequently Asked Questions
Is "defence" wrong in American English?
Yes, in standard American style guides (AP, Chicago Manual of Style) "defence" would be marked as a misspelling — "defense" is the required form in US contexts, including legal and journalistic writing.
Which spelling has higher search volume?
"Defense" typically has higher global search volume due to the size of the US audience online, but "defence" remains dominant in UK, Australian, Indian, and broader Commonwealth English content.
Does sports terminology follow the same rule?
Yes — American sports writing always uses "defense," while British sports writing (football/soccer, rugby, cricket) consistently uses "defence."
What about "defensive" — does the spelling change too?
No — "defensive" is spelled the same in both American and British English; the -se vs. -ce difference only appears in the noun and verb forms.
Are there other words that follow this exact -se/-ce pattern?
Yes — "offense/offence" and "pretense/pretence" follow the identical American/British split.
💡 The Takeaway
Match the spelling to your audience's English convention and stay consistent — both "defense" and "defence" are equally correct within their own region.
Looking for more grammar breakdowns like this? See our article on truely or truly, browse our full library of language guides, or check out our directory of the best AI writing tools.