Source : Webster's Revised Unabridged Dictionary (1913)

Distinctness \Dis*tinct"ness\, n.
   1. The quality or state of being distinct; a separation or
      difference that prevents confusion of parts or things.

            The soul's . . . distinctness from the body.
                                                  --Cudworth.

   2. Nice discrimination; hence, clearness; precision; as, he
      stated his arguments with great distinctness.

   Syn: Plainness; clearness; precision; perspicuity.

Source : WordNet®

distinctness
     n 1: the quality of being sharp and clear [syn: {sharpness}]
          [ant: {indistinctness}]
     2: the state of being several and distinct [syn: {discreteness},
         {separateness}, {severalty}]
     3: the quality of being not alike; being distinct or different
        from that otherwise experienced or known [syn: {otherness},
         {separateness}]