Source : Webster's Revised Unabridged Dictionary (1913)

Commonness \Com"mon*ness\, n.
   1. State or quality of being common or usual; as, the
      commonness of sunlight.

   2. Triteness; meanness.

Source : WordNet®

commonness
     n 1: the state of being that is commonly observed [syn: {expectedness}]
     2: the quality of lacking taste and refinement [syn: {coarseness},
         {grossness}, {vulgarity}, {vulgarism}, {raunch}]
     3: ordinariness as a consequence of being frequent and
        commonplace [syn: {commonplaceness}, {everydayness}] [ant:
         {uncommonness}]
     4: sharing of common attributes [syn: {commonality}] [ant: {individuality}]