Both defence and defense are correct spellings of the same English word. Defence is the standard form in British English and is also widely used in Australian, New Zealand, South African, and Canadian English; defense is the standard form in American English. Choose according to your audience, governing style guide, or an institution’s official name.
Key Facts at a Glance
- Defence is the usual British English spelling.
- Defense is the usual American English spelling.
- Both forms mean protection against attack, criticism, danger, or harm.
- The two spellings normally have the same pronunciation: /dɪˈfens/.
- The adjective is defensive in both major spelling systems, not defencive.
- Consistency matters more than choosing one form universally.
Which Spelling Is Standard Where?
Regional English determines whether writers normally select defence or defense. The distinction is orthographic, not semantic: British and American dictionaries define the two forms as the same noun, while national usage determines the preferred spelling.
| English variety | Usual spelling | Example | Typical institutional usage |
|---|---|---|---|
| British English | defence | national defence | UK Ministry of Defence |
| American English | defense | national defense | US Department of Defense |
| Australian English | defence | defence policy | Australian Department of Defence |
| New Zealand English | defence | defence force | New Zealand Defence Force |
| South African English | defence | defence budget | South African National Defence Force |
| Canadian English | Usually defence | defence counsel | Canadian Department of National Defence |
The regional rule is reliable in ordinary editorial writing, but proper names override it. A UK writer discussing the United States Department of Defense should preserve the American department’s official spelling. An American writer quoting the UK Ministry of Defence should preserve the British name.
Is Defence British English?
Yes. Defence is the standard spelling in British English, including common phrases such as criminal defence, defence lawyer, defence industry, and defence mechanism. British publishers, universities, government bodies, and newspapers generally use the form ending in -ce.
The spelling does not make a text more formal or more correct. It identifies the variety of English used by the writer or publication. A British newspaper would normally write, “The minister announced a new defence policy,” while an American newspaper would write, “The secretary announced a new defense policy.”
Is Defense American English?
Yes. Defense is the standard spelling in American English. Common US examples include defense attorney, defense spending, defense contractor, defense mechanism, and defense industry.
The US form appears in the official names of organizations, including the US Department of Defense and the Defense Advanced Research Projects Agency, commonly abbreviated as DARPA. Those names retain -se even when they appear in publications written for international readers.
Do Defence and Defense Mean Different Things?
Defence and defense do not normally differ in meaning, pronunciation, or grammatical function. Both can describe protection from physical attack, a legal response to an accusation, a sporting unit, or an argument that answers criticism.
| Use | British spelling | American spelling | Meaning |
|---|---|---|---|
| Military protection | national defence | national defense | Protection of a country |
| Legal representation | criminal defence | criminal defense | Case presented against an accusation |
| Sport | team defence | team defense | Play intended to stop scoring |
| Argument | a strong defence | a strong defense | Reason supporting a person or position |
| Biology | immune defence | immune defense | Protection against disease |
Pronunciation generally remains the same in both varieties. The spelling difference therefore does not signal a different object, legal standard, military doctrine, or sporting tactic.
One related word does have a specialized American meaning: defense can refer to the side representing an accused person, while defence does the same in British usage. The underlying legal role is identical.
Why Are There Two Spellings?
The two spellings developed through the separate standardization of British and American English. Defence came into English through Old French defens, from Latin defensum; defense is an established variant that became dominant in American English.
American spelling reform did not create a completely new word. In several word families, US usage preferred -se where British usage retained -ce, producing pairs such as defense/defence, offense/offence, and pretense/pretence. The pattern is historical rather than a universal rule for every English word.
No spelling is inherently closer to the Latin source in a way that makes the other incorrect. Modern correctness depends on the selected language variety and the publication’s editorial policy.
Which Derived Spellings Are Correct?
The standard adjective is defensive in both British and American English. The forms defencive and defenceive are incorrect in standard modern usage because the adjective is built from the defens- stem.
| Word or phrase | British English | American English | Status |
|---|---|---|---|
| Adjective | defensive | defensive | Correct in both |
| Adverb | defensively | defensively | Correct in both |
| Capable of being defended | defensible | defensible | Correct in both |
| Without protection | defenceless | defenseless | Regional variants |
| Person in a legal case | defendant | defendant | Same spelling |
| Person who defends | defender | defender | Same spelling |
| Sports player | defenceman | defenseman | Regional sports usage |
The important principle is not that every vowel-starting suffix automatically changes -ce to -se. The deeper explanation is that English has conventional word stems and historically established derivatives. Defensive, defensible, and defender are standard forms in both varieties.
Is Defencive Correct?
No. Defencive is not the standard spelling of the adjective. Write defensive in British, American, Australian, Canadian, and other major English varieties.
Examples include:
- The team adopted a defensive formation.
- The company installed defensive cybersecurity controls.
- The witness gave a defensive answer.
- The immune system mounted a defensive response.
Is Defenceless or Defenseless Correct?
Both are correct, but the regional preference differs. Defenceless is customary in British English, while defenseless is customary in American English. Australian, New Zealand, South African, and Canadian publications commonly follow the British -ce pattern, although individual style guides can specify otherwise.
The same regional contrast appears in some compounds and institutional expressions. However, writers should check the established form rather than mechanically alter every word containing defence.
Does the Same Rule Apply to Offence and Licence?
The -ce and -se contrast appears in several word pairs, but each word must be checked individually. British English generally uses offence, licence as a noun, and practise as a verb; American English uses offense, license for both noun and verb, and practice for both noun and verb.
| Meaning | British English | American English |
|---|---|---|
| Criminal or sporting violation | offence | offense |
| Permission, noun | licence | license |
| Grant permission, verb | license | license |
| Carry out an activity, verb | practise | practice |
| Performance or habit, noun | practice | practice |
| Pretended appearance | pretence | pretense |
The contrast between licence and license demonstrates why a simple suffix rule can mislead. British English distinguishes the noun licence from the verb license, whereas American English uses license for both. Editorial conventions, not one mechanical spelling formula, control the result.
How Should a Writer Choose?
Choose defence when writing in British English or for a publication whose style guide follows British conventions. Choose defense when writing in American English or for a US audience that expects American spelling.
Use this decision process:
- Identify the audience. A US legal brief requires defense; a UK legal article normally requires defence.
- Check the governing style guide. Follow the publication, university, employer, or client standard.
- Preserve official names. Write Department of Defense and Ministry of Defence exactly as those bodies style themselves.
- Keep the word family consistent. Pair defence with defenceless in British usage and defense with defenseless in American usage.
- Apply the rule across the document. Do not alternate between forms without a quotation, name, or deliberate audience change.
| Writing situation | Recommended form | Reason |
|---|---|---|
| US court filing | defense | American legal convention |
| UK newspaper article | defence | British editorial convention |
| Canadian university essay | Usually defence | Canadian English preference |
| Global company webpage | Audience-dependent | Choose one house style |
| Quoted government name | Official form | Proper names take priority |
| Search phrase copied from a user | Original form may remain | User wording can be preserved in a quote |
Which Form Should a Multinational Website Use?
A multinational website should choose a primary regional style and create localized versions when the audience, legal terminology, or product language requires it. A single global page can use either form, but alternating between defence and defense makes the editorial system look uncontrolled.
Search engines generally understand that the variants are equivalent. Writers should not publish duplicate pages solely to target both spellings unless the pages genuinely serve different regional audiences. A UK page can mention “defence, also spelled defense in American English” once, while a US page can reverse the explanation.
For legal, government, military, and education content, regional terminology deserves extra care because readers may interpret inconsistent spelling as evidence of copied or poorly reviewed material.
When Should You Preserve the Other Spelling?
Preserve the other spelling in official names, direct quotations, historical titles, bibliographic references, and source text whose wording matters. Change it in ordinary prose when your publication’s style guide requires regional consistency.
For example, a British report can write:
The US Department of Defense published its annual report.
The organization’s name remains Defense, while the surrounding British prose may use defence elsewhere. Similarly, a US article quoting a British minister should retain the spelling used in the original quotation if the quotation is reproduced exactly.
Brand names and titles can also override house style. A copy editor should not silently alter a registered name, a book title, a statute title, or an official department name.
Common Errors and How to Fix Them
Mixing forms in one regional document
Writing defence policy, defense spending, and defenceless civilians in one British document creates unnecessary inconsistency. Select the local forms before proofreading, then search the document for both variants.
Writing Defencive
Replace defencive with defensive. The correct adjective is identical in British and American English.
Changing official names
Do not change US Department of Defense to US Department of Defence in a formal reference. Do not change UK Ministry of Defence to UK Ministry of Defense when naming the institution.
Treating Canada as identical to the United States
Canadian English often uses defence, despite Canada’s proximity to the United States and extensive cultural exchange. Canadian publishers, institutions, and government bodies can still have individual style preferences, so a specific house guide takes priority.
Assuming spelling changes pronunciation
The words are normally pronounced alike. Readers infer regional spelling from the written form, not from a different spoken meaning.
Using the overview’s suffix explanation too literally
The claim that vowel-initial suffixes universally require -s is too broad. Defensive and defensible are correct because they are established derivatives, while the spelling of related words depends on lexical history and convention.
Expert Rules for Reliable Editing
Institutional names outrank regional preference. A style guide usually governs ordinary prose, but an official title is a fixed identifier. Editors should treat it like a person’s name rather than a normal spelling choice.
Search intent does not require spelling duplication. A page that explains both variants can satisfy users searching either form, provided the content establishes the equivalence clearly. Repeating both spellings in every paragraph weakens readability without adding semantic value.
Derivative words require separate verification. Writers who apply the apparent defence to defencive produce an error even though the base noun is correctly spelled. Check the complete word, not only its final two letters.
Canadian usage is a genuine middle case. Canadian English frequently aligns with British spelling in words such as defence, but Canadian style is not simply British English transplanted to North America. Government, legal, academic, and commercial contexts may use different editorial authorities.
FAQ
Is Defence More Correct Than Defense?
No. Defence is more appropriate in British English and several Commonwealth varieties, while defense is more appropriate in American English. Correctness depends on the language variety, audience, and style guide. Neither spelling is universally superior, and both represent the same standard English word.
Should I Use Defence or Defense in Canada?
Use defence as the usual Canadian English form, unless a client or publication specifies another style. Canadian government and institutional writing commonly follows the -ce spelling. Preserve Defense in an American organization’s official name, quotation, or source title.
Are Defence and Defense Pronounced Differently?
Usually not. Defence and defense are generally pronounced /dɪˈfens/ in both British and American English. The difference appears in writing, while pronunciation remains substantially the same across major English varieties.
Is the Legal Term Defense or Defence?
Both are correct regionally. US legal writing uses defense, as in criminal defense attorney; UK, Australian, Canadian, and New Zealand legal writing commonly uses defence, as in criminal defence solicitor. The legal process and meaning do not change with the spelling.
Is Defence Force One Word?
Usually no. Write defence force as two words in ordinary British, Australian, New Zealand, and related usage. Proper names may use capitalization, such as the New Zealand Defence Force. American writing generally uses defense force, also as two words, unless a specific name says otherwise.
Which Spelling Should a Website Use for SEO?
Use the spelling that matches the website’s primary audience, then mention the alternative naturally where clarification helps. Search engines typically recognize defence and defense as spelling variants. Regional landing pages are justified when language, law, products, or institutional terminology genuinely differs, not merely to repeat a keyword.
The Bottom Line
Defence or defense: which spelling is correct? Both are correct. Use defence for British and commonly Commonwealth English, and use defense for American English. Keep official names unchanged, write defensive in every major variety, and follow one consistent style throughout each document.
