Defence
The British spelling, inherited through French
Defense
The American spelling, built on the Latin stem
Key difference: Both are standard. Defence is British and Commonwealth, defense American — but defensive takes an S everywhere, which is the inconsistency Webster removed.
Both are standard: defence in Britain and the Commonwealth, defense in the United States. The revealing detail is that British English already writes defensive and defensible with an S. Webster simply extended that S to the noun, making it one of his few reforms with a clean internal logic.
Most transatlantic spelling splits are arbitrary — one authority chose one form, another chose the other, and habit did the rest. This one is not quite like that, because British English is inconsistent with itself and everybody who writes it knows the feeling without naming it.
You write defence. Then you write defensive. Nothing in the language explains why the same root takes a different letter three words later.
Which Spelling Is Right?
- Defence — United Kingdom, Ireland, Australia, New Zealand, South Africa, India, Canada.
- Defense — United States.
The same line divides offence / offense and pretence / pretense. Meaning and pronunciation are identical on both sides; nothing is at stake except consistency with your reader.
Why British English Contradicts Itself
The noun and its derivatives entered English by different doors.
Defence arrived through Old French defense, which by the medieval period was being written with a C in English. Defensive, defensible and defensively were formed later and built directly on the Latin stem defens-, which never had a C in it. British English kept both arrivals and never reconciled them.
Webster did reconcile them. His argument was straightforward: if the adjective is defensive, the noun should be defense. It is the same reasoning he applied elsewhere and, unusually, it survives scrutiny — this reform makes the language more regular rather than merely more American.
Which is why the British position here is the awkward one to defend. There is no principled reason for defence alongside defensive; there is only precedent. That is a perfectly good reason to keep a spelling, but it is worth knowing that it is the only one.
The Nouns That Split, the Adjectives That Do Not
| British noun | American noun | Adjective — everywhere |
|---|---|---|
| defence | defense | defensive, defensible |
| offence | offense | offensive |
| pretence | pretense | pretensious, pretension |
The right-hand column is the useful one. Whatever your dialect, the adjective takes an S. You only ever have a decision to make about the noun.
The Special Case: Licence and Practice
Two words in this family behave differently in British English, and they trip up more writers than defence ever will.
British English uses the C for the noun and the S for the verb:
- a driving licence (noun) — the pub is licensed (verb)
- piano practice (noun) — she practises daily (verb)
American English spells license with an S in both roles, and practice with a C in both.
There is a reliable test for British writers. Substitute advice and advise, where the two forms are pronounced differently and nobody gets it wrong. If advice fits, use the C spelling; if advise fits, use the S. A driving advice is wrong, a driving licence is right — same slot, same letter. This is covered in more detail in licensed vs licenced.
Defence and Defense in Real Sentences
British:
- "The Ministry of Defence published its defensive strategy."
- "He took offence, which was offensive to no one but himself."
American:
- "The Department of Defense cut the budget."
- "Their defense held for three quarters."
Proper nouns never translate. The UK's Ministry of Defence and the US Department of Defense keep their own spellings wherever they are mentioned. A British newspaper writes the US Department of Defense, because that is the institution's name, not a spelling choice.
Defence vs Defense: Side by Side
| Defence | Defense | |
|---|---|---|
| Region | UK, Ireland, Australia, NZ, South Africa, India, Canada | United States |
| Route into English | Old French defense, respelled with C | Latin stem defens- |
| Adjective | defensive | defensive |
| Internal consistency | none — C noun, S adjective | complete |
| In proper names | Ministry of Defence | Department of Defense |
A Memory Hook That Sticks
C for Commonwealth, S for States. It has no etymological basis whatsoever and it resolves defence, offence and pretence in one move.
The second half matters more: the adjectives never change. If you can remember that defensive is universal, you have removed two thirds of the opportunities to get this wrong.
Related Spelling Mixups
The -our split in colour vs color and the -re split in centre vs center come from the same reform programme, and licensed vs licenced covers the noun-verb rule that makes this family trickier than it looks. The whole pattern is mapped in the guide to commonly confused words.
Conclusion
Defence and defense are both correct, and the choice is regional. But this is the one transatlantic pair where the American form has the better argument: British English writes the adjective with an S already, and has no explanation for why the noun should differ.
Keeping defence is a decision to follow precedent over logic. That is usually how spelling works — it is just rare to be able to see it so clearly.
Frequently Asked Questions
Is defence or defense correct?
Both. Defence is standard in the United Kingdom, Ireland, Australia, New Zealand, South Africa, India and Canada; defense is standard in the United States. The words are identical in meaning and pronunciation, and the only mistake is using them inconsistently in the same text.
Why does British English write defence but defensive?
Because the noun came through French, which used a C, while the adjective was built directly on the Latin stem defens-, which used an S. British English kept both routes and lives with the mismatch. Webster found it indefensible and standardised the noun on the S its own derivatives already had — one of the rare reforms with a clean internal logic.
Which other words follow the same pattern?
Offence and offense, pretence and pretense behave identically: C in British English, S in American. Licence and practice are a special case, because British English uses the C for the noun and the S for the verb — a licence to drive, but licensed premises. American English spells license with an S in both roles.
Is defense ever used in British English?
In specific contexts, yes. International bodies and sports leagues that standardise on American English carry the S into British writing, and technical or legal documents drafted in the United States keep it. Otherwise a British publication that prints defense will look like it forgot to run a style check.
How do I remember which spelling goes where?
Tie the letter to the region: C for Commonwealth, S for States. It is not etymology, it is mnemonics, and it covers defence, offence and pretence at once. Then remember that the adjectives — defensive, offensive, pretension — take S everywhere, so you never have to decide about those.
Part of Commonly Confused Words & Spelling.
Keep exploring
Colour or Color: Which Spelling Should You Use?
Both are correct. Colour is British, color American — and the American form is the older Latin one, restored on purpose by Noah Webster.
Licensed vs Licenced: Which Is Correct?
Licensed is correct in both American and British English; licenced is a misspelling. The verb is always license. The US/UK noun rule, with clear examples.