Etymology
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conspirator (n.)

"one who plots or acts on evil or unlawful designs," c. 1400, conspiratour, from Old French conspirateur, from Latin conspiratorem (nominative conspiratorio), noun of action from past-participle stem of conspirare "to agree, unite, plot," literally "to breathe together" (see conspire).

Conspirer is attested from 1530s, from Anglo-French conspirour. Fem. form conspiratrice is from early 15c.; conspiratress is from 1760. Related: Conspiratory.

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Definitions of conspirator

conspirator (n.)
a member of a conspiracy;
Synonyms: coconspirator / plotter / machinator
From wordnet.princeton.edu