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Webster 1913 Edition

Noun.

[Gr. [GREEK] preceding in time; [GREEK] before + [GREEK] time: cf. F.

prochronisme

The dating of an event before the time it happened; an antedating; – opposed to

metachronism

Noun.

[Gr. to precede in time, before, and time.]

An antedating; the dating of an event before the time it happened; hence, an error in chronology.

prochronism ‎(plural prochronisms)