The Collaborative International Dictionary of English v.0.48:

Mundanity \Mun*dan"i*ty\, n.
   Worldliness. [Obs.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

mundanity
    n 1: the quality or character of being intellectually
         sophisticated and worldly through cultivation or experience
         or disillusionment [syn: sophistication, worldliness,
         mundaneness, mundanity] [ant: naiveness, naivete,
         naivety]
    2: the quality of being commonplace and ordinary [syn:
       ordinariness, mundaneness, mundanity] [ant:
       extraordinariness]