The Collaborative International Dictionary of English v.0.48:
Postpositive \Post*pos"i*tive\, a. [See Postpone.] Placed after another word; as, a postpositive conjunction; a postpositive letter. -- Post*pos"i*tive*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
postpositive adj 1: (of a modifier) placed after another word