believability

from WordNet (r) 3.0 (2006)

believability
    n 1: the quality of being believable or trustworthy [syn:
         {credibility}, {credibleness}, {believability}] [ant:
         {incredibility}, {incredibleness}]

from The Collaborative International Dictionary of English v.0.48

Believable \Be*liev"a*ble\, a.
   Capable of being believed; credible. -- {Be*liev"a*ble*ness},
   n. -- {Be*liev`a*bil"i*ty}, n.
   [1913 Webster]

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