Full record for posthuman n.

Definition a descendant of humans who is sufficiently different from present-day humans in form or capabilities to be regarded as a new species or otherwise fundamentally different from present-day humans
OED requirements antedating 1985
Earliest cite B. Sterling 'Schismatrix'
Comment Rick Hauptmann submitted a 2002 cite from Charles Stross' "Tourist". Malcolm Farmer submitted a cite from a 1986 reprint of Bruce Sterling's "Schismatrix"; Douglas Winston verified the cite in the 1985 first edition. Jeff Prucher submitted a 1991 cite from Lance Olson's "The Shadow of Spirit in William Gibson's Matrix Trilogy" in Extrapolation. Katrina Campbell submitted a 2002 cite from an article by Adam Nathan in the Sunday Times. Ralf Brown located and Fred Galvin verified a 1986 cite from Donald Moffitt's "Second Genesis". Jeff Prucher submitted a 2003 cite from Allen Steele's "The Madwoman of Shuttlefield".
Last modified 6 July, 2008

Citations for posthuman n.

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1985 B. Sterling Schismatrix 26 I've met many borderline posthumans in my day, but never one of you.
1986 D. Moffitt Second Genesis 321 He smiled at Mim and squeezed the hand clasping his. Methuselah pressed against his leg. Humans and posthumans drew closer together to share an ancient tribal comfort.
2002 C. Stross in Asimov's Sci. Fiction Feb. 18 Manfred is a core team member; losing him at this point could be more than embarrassing. Besides, he's a friend—as such things go for posthumans.
2002 D. Danvers Watch xviii. 293 But he's no android. Anchee is a post-human.
2006 N. Asher Polity Agent xv. 363 The reality, he felt sure, was that the AIs were the genuine post-humans.