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
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Authorities have not released additional details about what led to the confrontation or said whether investigators believe the woman's claim of self-defense. Greg Wehner, FOXNews.com, 2 July 2026 The woman who pulled the trigger is claiming self-defense, according to the Broward County Sheriff's Office, which is investigating the shooting. Meredith Deliso, ABC News, 2 July 2026 The 19-year-old, whose attorneys argued self-defense and are appealing his conviction, was found guilty of murder in the fatal stabbing of 17-year-old Austin Metcalf at a North Texas high school track meet. Harriet Ramos, Fort Worth Star-Telegram, 2 July 2026 Such bans have been passed in response to mass shootings, but gun rights advocates argue that millions of Americans own AR-15s for self-defense. Maureen Groppe, USA Today, 1 July 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

Browse Nearby Words

Cite this Entry

“Self-defense.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/self-defense. Accessed 5 Jul. 2026.

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

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