συνωμοσίαsynōmosía

a swearing together, i.e. (by implication) a plot

Greek (New Testament) · G4945

Meanings

a conspiracy: Acts 23:13.

Same root

σύνsýn · G4862with or together (but much closer than G3326 (μετά) or G3844 (παρά)), i.e. by association, companionship, process, resemblance, possession, instrumentality, addition, etc.
ὀμνύωomnýō · G3660to swear, i.e. take (or declare on) oath

Where it appears

Appears 1 times in the Bible.

Acts 23:13 There were more than forty of them in the conspiracy.

Source: G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), public domain.