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rarefaction (n.)

"act or process of making rare or expanding a body of matter (originally chiefly gases) so that a smaller number of particles occupy the same space," c. 1600, from French raréfaction or directly from Medieval Latin rarefactionem (nominative rarefactio), noun of action from past-participle stem of Latin rarefacere "make rare or thin" (see rarefy). Rarefication (1610s) also is used. Rarefactive is attested from early 15c.

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Definitions of rarefaction from WordNet

rarefaction (n.)
a decrease in the density of something;
a sound wave causes periodic rarefactions in its medium
From wordnet.princeton.edu

Dictionary entries near rarefaction

rapturous

rara avis

rare

rarebit

raree show

rarefaction

rarefy

rarely

rarify

rarity

ras