Breadcrumb Home > Thesaurus > E Synonyms of espionage Find synonyms for: Noun 1. espionage, spying, undercover work usage: the systematic use of spies to get military or political secrets WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of espionage (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language