Etymology
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backdate (v.)

also back-date, "assign a date to earlier than the actual one," by 1881 (implied in back-dated), from back (adv.) + date (v.1). Compare antedate. Related: Backdated; backdating.

updated on March 14, 2017

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Definitions of backdate from WordNet

backdate (v.)
make effective from an earlier date;
The increase in tax was backdated to January
From wordnet.princeton.edu, not affiliated with etymonline.