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.
Training on principles of personal security and self-defense should executives or their family fear for their physical safety. Control Risks, Forbes.com, 15 July 2025 His brother had had a gun, so Wright’s killing him was ruled self-defense. The Marshall Project, The Orlando Sentinel, 15 July 2025 Municipal restrictions: Many Arizona cities prohibit discharging firearms within city limits, even for self-defense. Tiffany Acosta, AZCentral.com, 14 July 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, 14 July 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

Browse Nearby Words

Cite this Entry

“Self-defense.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/self-defense. Accessed 19 Jul. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!