defection

noun

de·​fec·​tion di-ˈfek-shən How to pronounce defection (audio)
Synonyms of defectionnext
: conscious abandonment of allegiance or duty (as to a person, cause, or doctrine) : desertion

Examples of defection 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.
Secretary of State Marco Rubio also agreed to testify to Congress as the administration worked to stave off defections. Caitlin Yilek, CBS News, 30 Apr. 2026 The loss of the UAE is the single biggest defection in OPEC’s history. Nick Lichtenberg, Fortune, 28 Apr. 2026 Part of a wave of dissident departures, Carvajal’s defection was akin to a dam breaking, then-US Senator Marco Rubio said at the time. Max Saltman, CNN Money, 26 Apr. 2026 The Liberal majority and the recent defections are another blow to Conservative leader Pierre Poilievre, who lost the previous national election last year and even his own seat. ABC News, 13 Apr. 2026 See All Example Sentences for defection

Word History

Etymology

borrowed from Latin dēfectiōn-, dēfectiō "falling short, failure, abandonment of allegiance," from dēficere "to be lacking, fail, become disaffected, go over (to the side of an opponent)" + -tiōn-, -tiō, suffix of verbal action — more at deficient

First Known Use

1532, in the meaning defined above

Time Traveler
The first known use of defection was in 1532

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Cite this Entry

“Defection.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/defection. Accessed 3 May. 2026.

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