Pas*siv"i*ty (?), n. [Cf. F. passivité.] 1. Passiveness; -- opposed to activity. Jer. Taylor.

2. (Physics) The tendency of a body to remain in a given state, either of motion or rest, till disturbed by another body; inertia. Cheyne.

3. (Chem.) The quality or condition of any substance which has no inclination to chemical activity; inactivity.