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The Collaborative International Dictionary
Prochronism

Prochronism \Pro"chro*nism\, n. [Gr. ? preceding in time; ? before + ? time: cf. F. prochronisme.] The dating of an event before the time it happened; an antedating; -- opposed to metachronism.

Wiktionary
prochronism

n. An error in chronological order in which one is ascribed an earlier time.