/ Thesaurus / I Synonyms of indian summer Find synonyms for: Noun1. Indian summer, Saint Martin's summer, time period, period of time, periodusage: a period of unusually warm weather in the autumnWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language