Rar′e‐fac″tion (răr′ē̍‐făk″shŭn), n. [Cf. F. raréfaction. See Rarefy.] The act or process of rarefying; the state of being rarefied; — opposed to condensation; as, the rarefaction of air.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.