from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To mark or supply with a date that is earlier than the actual date: backdate a check.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To give or assign a date to a document that is earlier than the current date.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. to make effective from an earlier date; to make retroactive.
- transitive v. to affix a date earlier than the present date; -- sometimes done for fraudulent purposes. Opposite of
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. make effective from an earlier date
back + date (Wiktionary)