Defense is a noun with several related meanings, but it most often refers to protectingkeeping someone or something safe from harm or attack someone or something from harm or attack. It can also mean a reply that argues against an accusationa statement claiming a person did something wrong, or the people and systems involved in legal, militaryconnected with armed forces and war, or sports defense.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Pronunciation
AI-generated pronunciation audio (OpenAI).
Accent: General American English
IPA: /dih-FENS/
Easy pronunciation: dih-FENS (approximate spelling).
Stress: Stress the second syllable.
Used as a noun meaning protection against harm or attack.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Defense Meaning
protecting something from harm or attack
Part of speech: noun
Definition: the act of defending someone or something against attack or injury
Example: Good sunscreen is your first defense against sunburn.
Synonyms for this meaning:
- defence — British spelling variant
- protection — A close everyday substitute in this sense
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Other Meanings of Defense
Meaning 2
a reply that argues against criticism or an accusation
Part of speech: noun
Definition: the speech act of answering an attack on your assertions
Example: In her defense, she had warned everyone ahead of time.
Synonyms for this meaning:
- refutation — Works when the reply directly disproves an argument
- defence — British spelling variant
Meaning 3
the players whose job is to stop the other team from scoring
Part of speech: noun
Definition: (sports) the team that is trying to prevent the other team from scoring
Example: The defense played a much stronger second half.
Synonyms for this meaning:
- defending team — Direct match for the sports sense
- defence — British spelling variant
Meaning 4
the accused person and their lawyers together
Part of speech: noun
Definition: the defendant and his legal advisors collectively
Example: The defense asked for more time to review the evidence.
Synonyms for this meaning:
- defense lawyers — Refers to the lawyers, not always the whole legal side
- defense team — Common collective term
- defence — British spelling variant
Meaning 5
a formal denial of the charges
Part of speech: noun
Definition: a defendant's answer or plea denying the truth of the charges against him
Example: The defense was not persuasive to the jury.
Synonyms for this meaning:
- denial — A direct substitute in this legal sense
- demurrer — More technical and narrower in legal use
- defence — British spelling variant
Meaning 6
a structure built to protect against attack
Part of speech: noun
Definition: a structure used to defend against attack
Example: The old fort’s defenses were damaged in the bombardment.
Synonyms for this meaning:
- defensive structure — Direct match for a protective structure
- defence — British spelling variant
Meaning 7
a reason given to explain or justify something
Part of speech: noun
Definition: the justification for some act or belief
Example: He gave a careful defense of his decision.
Synonyms for this meaning:
- vindication — Works when the aim is to show something was right
- defence — British spelling variant
Meaning 8
the U.S. government department that handles national defense
Part of speech: noun
Definition: the federal department responsible for safeguarding national security of the United States; created in 1947
Example: He works for the Department of Defense.
Synonyms for this meaning:
- defense department — Common shortened form
- department of defense — Official department name
- dod — Common acronym
- united states department of defense — Full formal name
Meaning 9
a group organized to resist attack
Part of speech: noun
Definition: an organization of defenders that provides resistance against attack
Example: The defense held the border for several weeks.
Synonyms for this meaning:
- defence force — Direct equivalent
- defense force — Direct equivalent
- defence — British spelling variant
Meaning 10
military efforts or equipment used to protect a country
Part of speech: noun
Definition: (military) military action or resources protecting a country against potential enemies
Example: The country increased spending on defense.
Synonyms for this meaning:
- defensive measure — Fits the idea of protective action, but is broader and less standard
- defence — British spelling variant
Meaning 11
an unconscious mental process that reduces anxiety
Part of speech: noun
Definition: (psychiatry) an unconscious process that tries to reduce the anxiety associated with instinctive desires
Example: Some people use denial as a defense mechanism.
Synonyms for this meaning:
- defence mechanism — Direct equivalent in British spelling
- defence reaction — Less standard, but related in psychology
- defense mechanism — Direct equivalent
- defense reaction — Less standard, but related in psychology
- defence — British spelling variant
Meaning 12
being protected from harm
Part of speech: noun
Definition: protection from harm
Example: Vaccination is an important defense against infection.
Synonyms for this meaning:
- defence — British spelling variant
Reviewed with OpenAI Decisions. Assessment: inaccurate — correction needed. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Defense Synonyms
Similar Meaning
- protection
- defence
a reply that argues against criticism or an accusation
- refutation
the players whose job is to stop the other team from scoring
- defending team
the accused person and their lawyers together
- defense team
- defense lawyers
a formal denial of the charges
- denial
- demurrer
a structure built to protect against attack
- defensive structure
a reason given to explain or justify something
- vindication
the U.S. government department that handles national defense
- defense department
- department of defense
- dod
- united states department of defense
a group organized to resist attack
- defence force
- defense force
military efforts or equipment used to protect a country
- defensive measure
an unconscious mental process that reduces anxiety
- defence mechanism
- defence reaction
- defense mechanism
- defense reaction
Reviewed with OpenAI Decisions. Assessment: uncertain — manual review needed. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Common Mistakes
- Do not use defense to mean offense; they are opposites in sports and some legal contexts.
- Do not mix the abstract meaning 'protection' with the legal meaning 'the defendant and lawyers.'
- Defense and defence are spelling variants, not different words.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.
Frequently Asked Questions
What is the basic meaning of defense?
The most common everyday meaning is protection from harm or attack.
Is defense the same as defence?
Yes. Defense is the American spelling, and defence is the British spelling.
What are common synonyms for defense?
In the main protection sense, good synonyms include protection and, in some contexts, defence.
Can defense mean a legal team?
Yes. It can mean the defendant and their lawyers together in a court case.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-22. AI assessment; not a guarantee of accuracy.