Source : Webster's Revised Unabridged Dictionary (1913)

Plausibility \Plau`si*bil"i*ty\, n. [Cf. F. plausibilit['e].]
   1. Something worthy of praise. [Obs.]

            Integrity, fidelity, and other gracious
            plausibilities.                       --E. Vaughan.

   2. The quality of being plausible; speciousness.

            To give any plausibility to a scheme. --De Quincey.

   3. Anything plausible or specious. --R. Browning.

Source : WordNet®

plausibility
     n : apparent validity [syn: {plausibleness}] [ant: {implausibility}]