/ Thesaurus / S Synonyms of spontaneous combustion Find synonyms for: Noun1. spontaneous combustion, ignitionusage: ignition of a substance (as oily rags) resulting from an internal oxidation processWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: kiln Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language