Source : Webster's Revised Unabridged Dictionary (1913)

Peculiarity \Pe*cul`iar"i*ty\, n.; pl. {Peculiarities}.
   1. The quality or state of being peculiar; individuality;
      singularity. --Swift.

   2. That which is peculiar; a special and distinctive
      characteristic or habit; particularity.

            The smallest peculiarity of temper on manner.
                                                  --Macaulay.

   3. Exclusive possession or right. [Obs.] --Bp. Hall.

Source : WordNet®

peculiarity
     n 1: an odd or unusual characteristic [syn: {distinctive feature},
           {distinguishing characteristic}]
     2: a distinguishing trait [syn: {specialness}, {specialty}, {speciality},
         {distinctiveness}]
     3: something unusual -- perhaps worthy of collecting [syn: {curio},
         {curiosity}, {oddity}, {oddment}, {rarity}]