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coup d'etat (n.)

1640s, from French coup d'étate, literally "stroke of the state" (see coup). Technically any sudden, decisive political act, especially an important and unexpected change in the form and methods of a government, but in 20c. popularly restricted to the overthrow of a government.

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Definitions of coup d'etat from WordNet

coup d'etat (n.)
a sudden and decisive change of government illegally or by force;
Synonyms: coup / putsch / takeover
From wordnet.princeton.edu