/ Thesaurus / A Synonyms of air defense Find synonyms for: Noun1. air defense, defense, defence, defensive measureusage: defensive measures designed to destroy attacking enemy aircraft or missiles or to nullify their effectivenessWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: illegible Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language