Antonym: condense. Similar words: putrefy, rarefied, rarefaction, defy, liquefy, stupefy, rare, rarely. Meaning: ['rerɪfaɪ /'reər-] 
v. 1. lessen the density or solidity of 2. make more subtle or refined 3. weaken the consistency of (a chemical substance).
v. 1. lessen the density or solidity of 2. make more subtle or refined 3. weaken the consistency of (a chemical substance). 
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(1) Everyone ought to rarefy his spiritual life.
(2) The air rarefies at the top of the mountain.
(3) Climbers may experience difficulty breathing in the rarefied air at high altitudes.
(4) It is important for the state's future administrators to get out of the rarefied air of the capital.
(5) Upward-moving atmospheric waves could greatly heat a rarefied atmosphere.
(6) Not many of those present had first-hand knowledge of such rarefied accommodation, but they took his meaning.
(7) Increasingly, retailers and manufacturers are questioning whether Gore can continue to thrive at such rarefied levels.
(8) You might take tea in the rarefied surroundings of Eickhof, a cafe of quite overwhelming temptation for cake-lovers.
(9) A modular structure would also have the advantage of helping to avoid too rarefied an approach.
(10) What magic did these brothers possess that had catapulted them into the rarefied atmosphere of the multi-billionaires.
(11) The program helped talented people develop the rarefied skills of a Disney animator, and it became a fixture of the studio.
(12) Even in the rarefied world of foreign correspondents, Simon is a standout.
(13) So it's still in rarefied air, the Mercedes V12 S-class being the only saloon to come close.
(14) George Will, a political commentator of rarefied taste, is another who thinks that sport should be taken seriously. Sentencedict.com
(15) Nor are the problems confined to the rarefied atmosphere of corporate boardrooms.
(16) Here it is tranquil, there is a rarefied atmosphere - still deep blue waters.
(17) For heaven's sake, you've been breathing the rarefied air of the ivory tower for as long as I can remember.
(18) I don't think the rarefied air of the laboratory agrees with you!
(19) The insertion of an inner rod into the waveguide can rarefy the spectrum of the competing modes in the vicinity of the operating mode and restrict the mode competing effectively.
More similar words: putrefy, rarefied, rarefaction, defy, liquefy, stupefy, rare, rarely, infrared, honorary, library, agrarian, literary, contrary, librarian, arbitrary, itinerary, registrar, hierarchy, temporary, terrarium, supernumerary, temporarily, to the contrary, infrared light, contemporary, writ of certiorari, care for, refer, reform.