Wordnet 3.0
NOUN (1)
1. 
 a person regarded as nonexistent and having no rights; 
 a person whose existence is systematically ignored (especially for ideological or political reasons); 
- Example: "the former senator is treated as a nonperson by this administration"- Example: "George Orwell predicted that political dissidents would be treated as unpersons"[syn: nonperson, unperson]
WordNet (r) 3.0 (2006):
nonperson
    n 1: a person regarded as nonexistent and having no rights; a
         person whose existence is systematically ignored
         (especially for ideological or political reasons); "the
         former senator is treated as a nonperson by this
         administration"; "George Orwell predicted that political
         dissidents would be treated as unpersons" [syn:
         nonperson, unperson]