Source : Webster's Revised Unabridged Dictionary (1913)

Compatibility \Com*pat`i*bil"i*ty\, n. [Cf. F.
   compatibilit['e].]
   The quality or power of being compatible or congruous;
   congruity; as, a compatibility of tempers; a compatibility of
   properties.

Source : WordNet®

compatibility
     n 1: a feeling of sympathetic understanding [syn: {rapport}]
     2: capability of existing or performing in harmonious or
        congenial combination [ant: {incompatibility}]

Source : Free On-Line Dictionary of Computing

compatibility
     
        {compatible}