Webster’s Revised Unabridged Dictionary · 1913
Plausibility
Plau′si·bil′i·ty, n. [Cf. F. plausibilité.] 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.