Source : Webster's Revised Unabridged Dictionary (1913)

Nonsexual \Non*sex"u*al\, a.
   Having no distinction of sex; sexless; neuter.

Source : WordNet®

nonsexual
     adj : not havning or involving sex; "an asexual spore"; "asexual
           reproduction" [syn: {asexual}] [ant: {sexual}]