Breadcrumb Home > Thesaurus > P Synonyms of pentagon Find synonyms for: Noun 1. Pentagon usage: a government building with five sides that serves as the headquarters of the United States Department of Defense 2. Pentagon, bureaucracy, bureaucratism usage: the United States military establishment 3. pentagon, polygon, polygonal shape usage: a five-sided polygon WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of pentagon (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: hagiography Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language