Source : Webster's Revised Unabridged Dictionary (1913)

Strangeness \Strange"ness\, n.
   The state or quality of being strange (in any sense of the
   adjective).

Source : WordNet®

strangeness
     n 1: unusualness as a consequence of not being well known [syn: {unfamiliarity}]
          [ant: {familiarity}]
     2: the quality of being alien or not native; "the strangeness
        of a foreigner" [syn: {foreignness}, {curiousness}] [ant:
        {nativeness}]