Verisimilitude

Ver`i*si*mil"i*tude (?), n. [L. verisimilitudo: cf. OF. verisimilitude. See Verisimilar.] The quality or state of being verisimilar; the appearance of truth; probability; likelihood.

Verisimilitude and opinion are an easy purchase; but true knowledge is dear and difficult.
Glanvill.

All that gives verisimilitude to a narrative.
Sir. W. Scott.