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Meaning of rarefy

rar•e•fy

Pronunciation: (râr'u-fī"), [key]
— v., -fied, -fy•ing.
—v.t.
  1. to make rare or rarer; make less dense: to rarefy a gas.
  2. to make more refined, spiritual, or exalted.
—v.i.
  1. to become rare or less dense; become thinned: Moisture rarefies when heated.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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