PLAUSIBILITY
plausibility, plausibleness
(noun) apparent validity
Source: WordNet® 3.1
Etymology
Noun
plausibility (countable and uncountable, plural plausibilities)
(obsolete) The quality of deserving applause, praiseworthiness; something worthy of praise. [16th–17th c.]
• E. Vaughan
(now, rare) The appearance of truth, especially when deceptive; speciousness. [from 17th c.]
A plausible statement, argument etc. [from 17th c.]
(now in more positive sense) The fact of being believable; believability, credibility. [from 18th c.]
Source: Wiktionary
Plau`si*bil"i*ty, n. Etym: [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.
Source: Webster’s Unabridged Dictionary 1913 Edition