Breadcrumb Home > Thesaurus > R Synonyms of rarefaction Find synonyms for: Noun 1. rarefaction, concentration usage: a decrease in the density of something; "a sound wave causes periodic rarefactions in its medium" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of rarefaction (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: sectarian Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language