The Collaborative International Dictionary of English v.0.48:

Banality \Ba*nal"i*ty\, n.; pl. Banalities. [F. banalit['e].
   See Banal.]
   Something commonplace, hackneyed, or trivial; the
   commonplace, in speech.
   [1913 Webster]

         The highest things were thus brought down to the
         banalities of discourse.                 --J. Morley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

banality
    n 1: a trite or obvious remark [syn: platitude, cliche,
         banality, commonplace, bromide]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "banality":
   banalness, bromide, chestnut, cliche, commonness, commonplace,
   commonplace expression, commonplaceness, corn, corniness,
   familiar tune, familiarness, fustiness, hackneyed saying,
   hackneyedness, lieu commun, locus communis, mustiness, old joke,
   old saw, old song, old story, platitude, platitudinousness,
   prosaicism, prosaism, prose, reiteration, retold story,
   rubber stamp, shibboleth, squareness, staleness,
   stereotyped saying, tag, trite saying, triteness, triticism,
   truism, twice-told tale, unoriginality