/ Thesaurus / R Synonyms of rain date Find synonyms for: Noun1. rain date, dateusage: an alternative date set for some outdoor event in case it rains on the appointed date; "the rain date for the picnic will be the following Sunday"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abominable Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language