What does defense mean?
Defense refers to the action of protecting someone or something from attack, harm, or danger, whether through physical means, strategic planning, or verbal argument. In everyday use, it appears in contexts ranging from military operations ('national defense') to personal safety ('self-defense'), psychology ('a defense mechanism' as an unconscious strategy for coping with stress), and law, where it denotes the argument or case presented on behalf of an accused person. In sports, 'the defense' names the players or unit responsible for stopping the opposing team from scoring. The word is neutral in tone and widely applicable, making it useful across formal writing, journalism, and casual conversation. It derives from the Latin 'defensio,' meaning a guarding or protection, entered English via Old French during the Middle Ages, and has been a fixture of the language ever since, reflecting humanity's enduring concern with safeguarding what matters most.
The action or act of protecting someone or something from attack, harm, or danger.
"The soldiers mounted a strong defense of the city walls."
Commonly used in military, legal, psychological, and sporting contexts.
A legal argument or case presented to justify or exonerate an accused person.
"Her attorney built a compelling defense around the absence of physical evidence."
The team, players, or strategy responsible for preventing the opposing side from scoring in a game or sport.
"Their defense was impenetrable throughout the entire match."
Standard plural form; commonly used when referring to multiple protective measures, arguments, or strategies.
"The city's defenses were strengthened before the winter siege began."
In sports, 'the best defense is a good offense' is a proverb so old that its roots trace back to ancient Rome and Julius Caesar.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of defense
Defense comes from the Latin 'defensio,' meaning a guarding or protecting, formed from 'defendere,' meaning to ward off or protect. The word entered Middle English in the late medieval period by way of Old French 'defence,' which itself was borrowed directly from Latin. Its root connects it to a family of words including 'defend,' 'fend,' 'fence,' and 'offend,' all ultimately tracing back to the same Latin verb stem relating to striking away or warding off.
Related word forms
How defense is actually used
'Defense' is the standard American spelling, while British English uses 'defence.' The word carries no inherent negative or positive connotation and is used across formal and informal registers, from military strategy to law and sports commentary.
Easily confused with defense
'Defence' is simply the British English spelling of the same word, while 'defense' is standard in American English.