[syn: commonality, commonness]
The Collaborative International Dictionary of English v.0.48:
Commonness \Com"mon*ness\, n.
   1. State or quality of being common or usual; as, the
      commonness of sunlight.
      [1913 Webster]
   2. Triteness; meanness.
      [1913 Webster]
WordNet (r) 3.0 (2006):
commonness
    n 1: the state of being that is commonly observed [syn:
         commonness, expectedness]
    2: the quality of lacking taste and refinement [syn:
       coarseness, commonness, grossness, vulgarity,
       vulgarism, raunch]
    3: ordinariness as a consequence of being frequent and
       commonplace [syn: commonness, commonplaceness,
       everydayness] [ant: uncommonness]
    4: sharing of common attributes [syn: commonality,
       commonness] [ant: individualism, individuality,
       individuation]
Moby Thesaurus II by Grady Ward, 1.0:
87 Moby Thesaurus words for "commonness":
   Attic simplicity, accustomedness, averageness, banality, banalness,
   baseness, chasteness, classical purity, cliche, coarseness,
   common occurrence, commonality, commonplaceness, confirmedness,
   conventionality, corniness, currency, customariness, dullness,
   extensiveness, familiarness, fixedness, flatness, fourth-rateness,
   frequence, frequency, fustiness, garden variety, generality,
   habitualness, hackneyedness, homeliness, humbleness, ignobility,
   incidence, inferiority, inferiorness, insipidness, inveteracy,
   inveterateness, lowliness, lowness, matter-of-factness, meanness,
   mustiness, normality, oftenness, ordinariness, plainness,
   platitudinousness, plebeianism, poorness, prevalence, prosaicism,
   prosaicness, prosaism, prosiness, purity, rampantness, reign,
   relative incidence, rifeness, routineness, run, second-rateness,
   settledness, simpleness, simplicity, squareness, staleness,
   standardness, sweepingness, third-rateness, triteness,
   unembellishedness, unexceptionality, unidealism, unimaginativeness,
   unnoteworthiness, unoriginality, unpoeticalness, unremarkableness,
   unromanticism, usualness, vapidity, widespreadness, wontedness