Source : Webster's Revised Unabridged Dictionary (1913)

Conventionality \Con*ven`tion*al"i*ty\, n.; pl.
   {Conventionalities}.
   The state of being conventional; adherence to social
   formalities or usages; that which is established by
   conventional use; one of the customary usages of social life.

Source : WordNet®

conventionality
     n 1: conformity with conventional thought and behavior
     2: unoriginality as a result of being too conventional [ant: {unconventionality}]
     3: orthodoxy as a consequence of being conventional [syn: {convention},
         {conventionalism}] [ant: {unconventionality}]