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.
How far do Texas self-defense laws go? Danya Gainor, CNN Money, 3 Sep. 2025 The homicide figures do not include killings that occurred in self-defense or in other circumstances not measured in Chicago police statistics. Kori Rumore, Chicago Tribune, 2 Sep. 2025 At some point, when Vaughan likely reached up in self-defense, Smith said, Hawthorne bit the tip of his thumb off and spit it out. Charlotte Observer, 2 Sep. 2025 According to court documents, a suspect, whose name was redacted, told detectives the shooting was in self-defense. Robert A. Cronkleton, Kansas City Star, 2 Sep. 2025 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 9 Sep. 2025.

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

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