Meaning

noun a secret agreement between two or more people to perform an unlawful act

noun a plot to carry out some harmful or illegal act (especially a political plot)

noun a group of conspirators banded together to achieve some harmful or illegal purpose

originFrom Middle English conspiracie, from Anglo-Norman conspiracie, from Latin cōnspīrātiō, from conspire + -acy.

Etymology from Wiktionary, CC BY-SA 3.0