Breadcrumb Home > Thesaurus > I Synonyms of investigation Find synonyms for: Noun 1. probe, investigation, inquiry, enquiry, research usage: an inquiry into unfamiliar or questionable activities; "there was a congressional probe into the scandal" 2. investigation, investigating, work usage: the work of inquiring into something thoroughly and systematically WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of investigation (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language