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.
These include physical resilience, self-defense, marksmanship, map reading, and military law. Arkansas Online, 8 Feb. 2026 Except for immediate self-defense, the president must get Congress’s approval before military action abroad, ensuring accountability and shared responsibility. Rebecca Noel, Charlotte Observer, 6 Feb. 2026 Crowley-Sanders was assaulted by a group of women in the restroom and fired her gun in self-defense, ending the altercation, according to the lawsuit. Lauren Penington, Denver Post, 5 Feb. 2026 And any claim of self-defense by Tomlyn or Chloe could be bolstered by Bullock’s prior domestic violence charge, Falk added. Matthew Adams, Fort Worth Star-Telegram, 5 Feb. 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

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Cite this Entry

“Self-defense.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/self-defense. Accessed 14 Feb. 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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