noun.
A human who has been stripped of rights, identity or humanity.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a person regarded as nonexistent and having no rights; a person whose existence is systematically ignored (especially for ideological or political reasons)
Word Usage
"In Orwell's term, Cortés has become an "unperson" -- not "nonperson," as the word is so frequently misquoted."