2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Rarefaction \Rar`e*fac"tion\ (r[a^]r`[-e]*f[a^]k"sh[u^]n), n. [Cf. F. rar['e]faction. See {Rarefy}.] The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air. [1913 Webster] From WordNet (r) 2.0 [wn]: rarefaction n : a decrease in the density of something; "a sound wave causes periodic rarefactions in its medium"
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