The Collaborative International Dictionary of English v.0.48:

Respectability \Re*spect`a*bil"i*ty\ (r?*sp?kt`?*b?l"?*t?), n.
   The state or quality of being respectable; the state or
   quality which deserves or commands respect.
   [1913 Webster]

WordNet (r) 3.0 (2006):

respectability
    n 1: honorableness by virtue of being respectable and having a
         good reputation [syn: respectability, reputability]
         [ant: disreputability, disreputableness,
         unrespectability]

The Devil's Dictionary (1881-1906):

RESPECTABILITY, n.  The offspring of a _liaison_ between a bald head
and a bank account.