Breadcrumb Home > Dictionary > Index Q Q clearance: Meaning and Definition of Find definitions for: Q clearance Pronunciation: [key] (in the Nuclear Regulatory Commission) the highest level of security clearance, permitting access to secret information, documents, etc., relating to nuclear research. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Q-Celtic q.d. TrendingHere are the facts and trivia that people are buzzing about. Hard Labor Current Events This Week: June 2023 Languages Spoken in Each Country of the World User's Guide to Environmental Language The Washington Monument: Facts, History & Profile LGBT Pride Month | Biographies of Notable Individuals Civilian Labor Force ✖ Related Content Daily Word Quiz: visceral Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language