the act or process of liquefying or making liquid.
the state of being liquefied.

1375–1425; late Middle English < Late Latin liquefactiōn- (stem of liquefactiō) a melting, equivalent to Latin liquefact(us) (past participle of liquefacere to melt, liquefy) + -iōn- -ion

liquefactive, adjective

evanescence, evaporation, liquefaction, melting, thawing, transpiration, vaporization. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
liquefy (ˈlɪkwɪˌfaɪ)
vb , -fies, -fying, -fied
(esp of a gas) to become or cause to become liquid
[C15: via Old French from Latin liquefacere to make liquid]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 15c., from Fr. liquéfaction, from L. liquefactionem, noun of action from liquefacere (see liquefy).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

liquefaction liq·ue·fac·tion (lĭk'wə-fāk'shən)

  1. The process of liquefying.

  2. The state of being liquefied.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
liquefaction   (lĭk'wə-fāk'shən)  Pronunciation Key 
  1. Chemistry The act or process of turning a gas into a liquid. Liquefaction is usually achieved by compression of vapors (provided the temperature of the gas is below the critical temperature), by refrigeration, or by adiabatic expansion.

  2. Geology The process by which sediment that is very wet starts to behave like a liquid. Liquefaction occurs because of the increased pore pressure and reduced effective stress between solid particles generated by the presence of liquid. It is often caused by severe shaking, especially that associated with earthquakes.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


change of a solid into a liquid when heat is applied. In a pure crystalline solid, this process occurs at a fixed temperature called the melting point (q.v.); an impure solid generally melts over a range of temperatures below the melting point of the principal component. Amorphous (non-crystalline) substances such as glass or pitch melt by gradually decreasing in viscosity as temperature is raised, with no sharp transition from solid to liquid

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Earthquake liquefaction has been sorely misunderstood.
It's a conjunction of phenomenon as the main phenomenon is called the
  liquefaction of land.
Sintering is the process of turning powder into solid using heat, but without
For example, gasoline produced via direct liquefaction of coal has a high
  aromatic content, giving it a high octane rating.
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