- to date earlier than the actual date; predate; antedate: Backdate the letter so he'll think I wrote it last week.
Origin of backdate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- (tr) to make effective from an earlier datethe 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
Word Origin and History for back-dated
Online Etymology Dictionary, © 2010 Douglas Harper