LATIN DICTIONARYLexicon Latīnum
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“conspiracy” in Latin

The English word conspiracy itself goes back to Latin spīrō, through cōnspīrātiō.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

conspiracy
conjuratio (the proper word): conspiratio (any association either for good or bad purposes): to form a conspiracy [Vid: To CONSPIRE]: to discover a conspiracy, conjurationem invenire atque deprehendere: conjurationem detegere (of a non-conspirator): conjurationem patefacere or prodere (on the part of a member): to suppress a conspiracy, conjurationem opprimere: privy to a conspiracy, conjurationis conscius, or (from context) conscius only.

Quick answer

What is the Latin word for conspiracy?
The usual Latin words for “conspiracy” are coniūrātiō, cōnspīrātiō, prōsum; also cōnscius. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.