Source : Webster's Revised Unabridged Dictionary (1913)

Passivity \Pas*siv"i*ty\, n. [Cf. F. passivit['e].]
   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.

Source : WordNet®

passivity
     n 1: the trait of remaining inactive; a lack of initiative [syn:
          {passiveness}]
     2: submission to others or to outside influences [syn: {passiveness}]