/ Thesaurus / T Synonyms of thermionic emission Find synonyms for: Noun1. thermionic emission, thermal emission, emissionusage: the emission of electrons from very hot substancesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language