self-defense

noun

self-de·​fense ˌself-di-ˈfen(t)s How to pronounce self-defense (audio)
1
: a plea of justification for the use of force or for homicide
2
: the act of defending oneself, one's property, or a close relative

Examples of self-defense in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Instead of backing her, the courts convict her for killing her attacker in self-defense. — Anna Marie De La Fuente, Variety, 28 Aug. 2026 The suspect’s father, Nassua Tate, told the Daily News that his son was not an aggressive person and acted in self-defense. — Molly Crane-Newman, New York Daily News, 28 Aug. 2026 The final frontier is getting more and more contested, so satellite companies are investing in some self-defense. — Mike Wall, Space.com, 25 Aug. 2026 In the Artibonite, gangs continued their territorial expansion through indiscriminate attacks on localities, targeting members of self-defense groups and residents inside their homes or in the streets, as well as farmers working in their fields. — Jacqueline Charles, Miami Herald, 25 Aug. 2026 See All Example Sentences for self-defense

Word History

First Known Use

1609, in the meaning defined at sense 2

Time Traveler
The first known use of self-defense was in 1609

Rhymes for self-defense

See All Rhymes for self-defense

Browse Nearby Words

self-defeating
self-defense
self-defensive
See all Nearby Words

Cite this Entry

“Self-defense.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/self-defense. Accessed 1 Sep. 2026.

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Kids Definition

self-defense

noun
self-de·​fense
ˌself-di-ˈfen(t)s
: the act of defending oneself, one's property, or a close relative

Legal Definition

self-defense

noun
self-de·​fense
ˈself-di-ˈfens
1
: the use of force to defend oneself
2
: an affirmative defense (as to a murder charge) alleging that the defendant used force necessarily to protect himself or herself because of a reasonable belief that the other party intended to inflict great bodily harm or death see also justification sense 2

More from Merriam-Webster on self-defense

Britannica.com: Encyclopedia article about self-defense

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