/ Thesaurus / L Synonyms of light reaction Find synonyms for: Noun1. light reaction, photochemical reactionusage: the first stage of photosynthesis during which energy from light is used for the production of ATPWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language