Breadcrumb Home > Thesaurus > U Synonyms of understructure Find synonyms for: Noun 1. foundation, base, fundament, foot, groundwork, substructure, understructure, support usage: lowest support of a structure; "it was built on a base of solid rock"; "he stood at the foot of the tower" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of understructure (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: quisling Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language