From The Collaborative International Dictionary of English v.0.48 :
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.
[1913 Webster]
Verisimilitude and opinion are an easy purchase; but
true knowledge is dear and difficult. --Glanvill.
[1913 Webster]
All that gives verisimilitude to a narrative. --Sir. W.
Scott.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
verisimilitude
n 1: the appearance of truth; the quality of seeming to be true