Full record for psychohistory n.

Definition	the theory that the history of large populations is statistically predictable, based on psychological theories of human and social behaviour; science based on this theory
OED requirements	antedating 1942
Earliest cite	I. Asimov in Astounding Sci. Fiction June
Comment	There are prior non-sf usages, but this is almost certainly the first usage in the sf sense.
Last modified	6 July, 2008

Citations for psychohistory n.

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1951 I. Asimov Foundation Trilogy—Foundation i. i. 3

Undoubtedly his greatest contributions were in the field of psychohistory.