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rarefy

American  
[rair-uh-fahy] / ˈrɛər əˌfaɪ /

verb (used with object)

rarefied, rarefying
  1. to make rare or rarer; make less dense.

    to rarefy a gas.

  2. to make more refined, spiritual, or exalted.


verb (used without object)

rarefied, rarefying
  1. to become rare or less dense; become thinned.

    Moisture rarefies when heated.

rarefy British  
/ ˈrɛərɪˌfaɪ /

verb

  1. to make or become rarer or less dense; thin out

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Etymology

Origin of rarefy

First recorded in 1350–1400; Middle English rarefien, from Middle French rarefier, from Medieval Latin rārificāre, from Latin rārēfacere, equivalent to rārē-, irregular, unexplained combining form of rārus + facere “to make”; see origin at rare 1, -fy

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Although these sculptures pay tribute to commercialism, they rarefy it to something austere — or at least as austere as anything with pulsing green lights can be.

From Washington Post Apr. 19, 2018

Of course it’s serious, and art is serious, but I’m not going to rarefy it.”

From New York Times Dec. 16, 2011

It contains moist air and a movable diaphragm or piston to rarefy it suddenly.

From Time Magazine Archive

The air consequently was damp and gross, for want of stronger rays to open and rarefy it.

From The Boys' and Girls' Plutarch being parts of the "Lives" of Plutarch, edited for boys and girls by John S. (John Stuart) White

The hot air in the smoke flues will warm the separating brick partition, and consequently rarefy the air in the ventilating flue.

From A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition) by Calvin Cutter

In the same way that regional brands like Shake Shack and In-N-Out have maintained cult followings for their novelty, Cane’s has no doubt benefited from the same kind of rarefied air.

From Slate Aug. 24, 2026

So far, Whoop has focused its marketing efforts on positioning itself as an aspirational brand worn by some of the fittest people in the world in the most rarefied spaces.

From The Wall Street Journal Jul. 8, 2026

His mental adjustment on how to react to failure, combined with a conditioning program that led him to lose 10 pounds and become faster and stronger, created a spring environment sending him into rarefied air.

From Los Angeles Times Jun. 7, 2026

On Friday, Trump will pay a visit to Zhongnanhai, a rarefied compound where China's leaders live and work.

From BBC May 13, 2026

Even Amaranta, lying in a wicker basket, observed with curiosity the absorbing work of her father and her brother in the small room where the air was rarefied by mercury vapors.

From "One Hundred Years of Solitude" by Gabriel Garcia Marquez

After rarefying to 5,000 sequences per sample, a total of 307,572 unique sequences were contained in the 96 studies and 23,828 samples of the ‘QC-filtered’ Deblur 90-bp observation table.

From Nature Oct. 31, 2017

The porous condition of the bone, which is here shown, is a result of a rarefying or rarefactive ostitis.

From Diseases of the Horse's Foot by Harry Caulton Reeks

These tubercles may be present in large numbers at the expense of the living tissue, and a rarefying ostitis is thus produced.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 2 "Bohemia" to "Borgia, Francis" by Various

And here, it is proper to add, that all aromatics, by rarefying the blood, are cordial.

From A Treatise on Foreign Teas Abstracted From An Ingenious Work, Lately Published, Entitled An Essay On the Nerves by Hugh Smith

And thinning, with escaping pressure, rarefying so that I could feel the grasp of it in my lungs and the pin-pricks in my cheeks.

From Brigands of the Moon by Ray Cummings

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