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Dictionary Language resources

rarefaction

Pronunciation: /ˌrɛːrɪˈfakʃ(ə)n/

Definition of rarefaction

noun

[mass noun]

reduction in the density of something, especially air or a gas: opposed processes such as rarefaction and condensation [count noun]:a series of rarefactions and compactions
Medicine the lessening of density of tissue, especially of nervous tissue or bone: the cord has undergone rarefaction