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backdate

[bak-deyt] /ˈbækˌdeɪt/
verb (used with object), backdated, backdating.
1.
to date earlier than the actual date; predate; antedate:
Backdate the letter so he'll think I wrote it last week.
Origin of backdate
1945-1950
1945-50, Americanism; back2 + date1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for back-dated

backdate

/ˌbækˈdeɪt/
verb
1.
(transitive) to make effective from an earlier date: the pay rise was backdated to August
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for back-dated

backdate

v.

also back-date, by 1881 (implied in back-dated), from back (adv.) + date (v.1). Cf. antedate. Related: Backdated; backdating.

Online Etymology Dictionary, © 2010 Douglas Harper
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12
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