Source : Webster's Revised Unabridged Dictionary (1913)

Individuality \In`di*vid`u*al"i*ty\, n.; pl. {Individualities}.
   [Cf. F. individualit['e].]
   1. The quality or state of being individual or constituting
      an individual; separate or distinct existence; oneness;
      unity. --Arbuthnot.

            They possess separate individualities. --H. Spencer.

   2. The character or property appropriate or peculiar to an
      individual; that quality which distinguishes one person or
      thing from another; the sum of characteristic traits;
      distinctive character; as, he is a person of marked
      individuality.

Source : WordNet®

individuality
     n 1: the quality of being individual; "so absorbed by the
          movement that she lost all sense of individuality" [syn:
           {individualism}, {individuation}] [ant: {commonality}]
     2: the distinct personality of an individual regarded as a
        persisting entity; "you can lose your identity when you
        join the army" [syn: {identity}, {personal identity}]