antedating
verb
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To occur before an event or time; to exist further back in time.
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To assign a date to a document or action earlier than the actual date; to backdate.
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To find earlier citational evidence for a term.
Synonyms:
backdate, foredate, predate
Antonyms:
overdate, postdate, postdate
noun
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The action of marking with an earlier date.
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An earlier citation of a lexical item.
"The new edition of the dictionary contains several antedatings."