Defence vs Defense: Spelling by Region

Defense is the American spelling and defence is the spelling used in the UK, Australia, Canada, New Zealand and Ireland. The meaning is the same in every country: protection against attack, the case made for an accused person, or the players trying to stop the other team from scoring.

What makes this pair worth a closer look is its family. Defensive and defensible take an s everywhere, even in Britain, while defenceless switches with the base word. Official names, from the US Department of Defense to the UK Ministry of Defence, never change. Get those details right and you will avoid the errors editors catch most.

Quick answer: US: defense, offense, defenseless. UK, Australia, Canada, Ireland, NZ: defence, offence, defenceless. Everywhere: defensive, defensible, defend with an s or d.

On this page

1. A Short History of the C and the S
2. What the Word Means
3. The Defence Family
4. Names That Never Change
5. 23 Example Sentences
6. US vs UK vs Australia
7. Errors That Slip Through
8. Prepositions and Phrasing That Differ by Country
9. A Five-Second Check
10. A memory trick
11. Writing Tips for International Audiences
12. Quick Quiz
13. One Thing to Remember

A Short History of the C and the S

The word came into English in the thirteenth century from Old French defens and defense, ultimately from Latin defensum, "something warded off," the past participle of defendere, "to ward off." The Latin form had an s, and so did most early English spellings.

So why does British English use a c? Over the sixteenth and seventeenth centuries, English writers increasingly spelled the -ense sound as -ence, following the pattern of words like fence (itself a shortened form of defence), hence and pence. By the eighteenth century, defence and offence had become the British norm.

American English moved back toward defense in the nineteenth century, in line with Noah Webster's preference for spellings closer to Latin and to pronunciation. That is why the US uses defense and offense, and why American and British spellings agree on defensive, which kept the Latin s throughout.

The noun/verb pattern you see in licence vs license is a cousin of this story, but defence has no British verb spelled defense. The verb is simply defend.

What the Word Means

The word covers a wide range of meanings, all spelled the same within each variety.

Protection and the military

• protection against attack or harm: "the defence of the realm," "a strong defense against disease"
• the military and the government department that runs it: "spending on defence," "a career in defense"
• physical structures that protect: "coastal defences," "flood defenses"

Law

• the case presented on behalf of the accused: "The defense argued that the evidence was unreliable."
• the lawyers representing the accused: "The defence called three witnesses."
• a legal justification: "self-defence," "a defense of necessity"

Sport

• the players or tactics trying to prevent scoring: "The Eagles' defense held firm," "England's defence looked shaky."

Argument and psychology

• an argument supporting an idea: "a spirited defence of free speech"
• a psychological response to anxiety: "defense mechanism"

Pronunciation

In general use, both spellings are pronounced dih-FENSS. In American sports, especially football and basketball, Americans often say DEE-fenss, stressing the first syllable to contrast it with AW-fenss (offense). Fans chanting "DEE-fense!" at a stadium in Texas or Wisconsin are using that sports pronunciation. British and Australian speakers usually keep the stress on the second syllable, even in sport.

The Defence Family

This table shows which related words switch and which stay the same.

The pattern is simple once you see it: the bare nouns defence/offence/pretence and their direct compounds switch, while adjectives built from the Latin stem (defensive, defensible, offensive) always use s. A British writer can correctly write "the defence was too defensive" without contradicting herself.

Other -ence / -ense words

Do not overapply the rule. Most -ence words, such as evidence, confidence, presence, licence (in British English) and sentence, are spelled the same everywhere, except for licence itself. The -ense/-ence split is limited to a small group, mainly defence, offence and pretence.

Two common words go the other way and are spelled with s everywhere: expense and sense. Dense, tense and immense also never change.

Names That Never Change

Official names keep their own spelling regardless of your house style. This matters a lot in news, government and defense-industry writing.

An Australian article about a joint exercise might therefore correctly mention both "the Australian Defence Force" and "the US Department of Defense" in the same sentence. That is not inconsistency; it is accuracy.

23 Example Sentences

Everyday life

1. The best defense against a cold is plenty of sleep and washing your hands.
2. In his defence, he did text to say he'd be late.
3. My brother in Cork took a self-defence class after moving to the city.
4. The puppy looked so defenceless curled up on the couch.
5. Grandpa insists that a good defense wins championships, not flashy offense.
6. She leapt to my defense when the waiter got our order wrong.

Workplace and email

7. Hi Raj, please prepare a defense of the budget figures before Thursday's board meeting.
8. The Canberra team works closely with the Department of Defence on procurement.
9. Our cybersecurity software provides a first line of defense against phishing.
10. I don't want to sound defensive, but the delay wasn't caused by our team.
11. The Bristol firm specializes in flood defence engineering for coastal towns.
12. Please note that no offence was intended by the comment in yesterday's email.

Academic and legal

13. The defense attorney argued that the confession had been obtained under pressure.
14. The thesis examines Britain's coastal defences during the Napoleonic Wars.
15. Researchers studied how the immune system's defenses respond to new viruses.
16. The court rejected the defence of provocation in the Queensland case.
17. Her dissertation offers a careful defence of utilitarian ethics.

News and sport

18. The Pentagon said the Department of Defense would review the contract.
19. The Ministry of Defence confirmed that two RAF jets were scrambled on Tuesday.
20. Australia's defence budget will rise under the new strategic review.
21. The Chiefs' defense forced three turnovers in the second half.
22. England's defence was exposed twice in the opening ten minutes at Wembley.
23. The Swans' defence held firm as Sydney won by eight points at the SCG.

US vs UK vs Australia

United States

American English uses defense, offense and pretense. These are the only standard forms in American newspapers, government and law. Sport adds a distinct pronunciation (DEE-fense) and very frequent use, since American football and basketball commentary talks about offense and defense constantly.

United Kingdom

British English uses defence, offence and pretence. The Ministry of Defence, British courts and newspapers all use c. British sports coverage uses defence too, as in football, rugby and cricket ("a defensive shot," "the defence line"). A British reader would see defense as clearly American.

Australia

Australian English follows British spelling. Government bodies use Defence (the Department of Defence, the Australian Defence Force), and Australian newspapers write defence for both the military and sport. In Australian rules football, writers talk about a team's defence and its defenders; in rugby league and union, too, the c spelling is universal.

Canada and elsewhere

Canada, Ireland and New Zealand use defence. Canada's Department of National Defence is a well-known example.

Errors That Slip Through

❌ The Australian Defense Force has deployed troops to the Pacific. ✅ The Australian Defence Force has deployed troops to the Pacific. (Official name.)

❌ The Pentagon is home to the US Department of Defence. ✅ The Pentagon is home to the US Department of Defense. (Official name.)

❌ The team was too defencive in the second half. ✅ The team was too defensive in the second half. (Always s.)

❌ No offense, but your report is late, in a British office email. ✅ No offence, but your report is late.

❌ The defense presented its case, in an Australian court report. ✅ The defence presented its case.

❌ The castle's defences were weak; its defenses had not been repaired, in one paragraph. ✅ The castle's defences were weak; they had not been repaired. (One spelling throughout.)

Prepositions and Phrasing That Differ by Country

Spelling is not the only thing that shifts. A few phrases built around the word are worded differently on each side of the Atlantic, and getting them right makes your writing sound native rather than translated.

"On defense" vs "in defence"

In American sports talk, a team or player is on defense: "He plays on defense," "They were strong on defense all season." Americans also play defense without an article. British and Australian commentators more often say a player is in defence or at the back, and a footballer "plays in defence." Both are idiomatic in their own variety, so match the phrase to the audience along with the spelling.

Choosing the right preposition

• defence against a threat: "a defence against flooding," "a defense against malware"
• defence of something you protect or argue for: "the defence of Singapore," "a defense of the policy"
• in defence of a person or idea: "She spoke in defence of her colleague."
• defence to a charge (legal): "Truth is a defence to defamation."

The legal defence to surprises many readers, but it is standard in law reports in all three countries.

The thesis "defense"

In the US, a doctoral candidate usually defends a dissertation at an oral examination called a dissertation defense or thesis defense. In the UK, the equivalent oral exam is normally called a viva (short for viva voce), and students rarely call it a "defence." In Australia, PhD theses have traditionally been assessed in writing by external examiners, though some universities now add an oral component. If you are writing for students in several countries, "oral examination" is the neutral term.

A Five-Second Check

Before you hit send, search your document for defen. Every hit should be one of three things: your chosen spelling of the noun (defense or defence), an adjective with s (defensive, defensible), or an official name you have left untouched. Anything else, such as defencive or a stray second spelling of the noun, needs fixing.

A memory trick

Think of a fence: a fence is a simple defence, and in British English defence* literally contains the word fence. (Historically, fence is in fact a shortened form of defence.) Americans swapped the c for the s found in defensive*.

For the adjectives, use this line: "Defensive is the same on both sides." Whatever side of the ocean you are on, defensive and defensible take s.

Writing Tips for International Audiences

If you are writing for one market, use its spelling consistently and keep official names unchanged. For international audiences, choose one house style. Many international organizations use British spelling, while American companies tend to keep American spelling worldwide.

Pay particular attention when you edit text from mixed sources, such as wire reports, press releases and quotations. These often bring in the "other" spelling, and a quick search for defense and defence will catch most inconsistencies. For a broader view of patterns like this, see our British vs American vs Australian spelling guide, and for a closely related -re/-er split, read centre vs center.

Quick Quiz

1. (Australian newspaper) The ______ minister announced new submarines for the navy. (defence / defense)
2. (US sports site) The Ravens' ______ held the opposition to just ten points. (defence / defense)
3. (Any audience) Don't be so ______; it was just a suggestion. (defencive / defensive)
4. (UK court report) The ______ argued that the witness was unreliable. (defence / defense)
5. (Any audience) The Pentagon houses the US Department of ______. (Defence / Defense)
6. (Canadian magazine) The kitten looked completely ______. (defenceless / defenseless)

Answers

1. defence – Australian English uses c.
2. defense – American English uses s.
3. defensive – The adjective uses s in every country.
4. defence – British English uses c, including in legal contexts.
5. Defense – The official name of the US department.
6. defenceless – Canadian spelling follows the British c.

One Thing to Remember

For the noun, think of geography: defense for American readers and defence for readers in Britain, Australia, Canada, Ireland and New Zealand, with offence/offense and pretence/pretense following the same rule. For adjectives, remember that defensive and defensible use an s everywhere. For names, change nothing at all.