fleeting; transitory: a sensational story with but a fugacious claim on the public's attention.
Botany. falling or fading early.

1625–35; < Latin fugāci- (stem of fugāx apt to flee, fleet, derivative of fugere to flee + -ous

fugaciously, adverb
fugaciousness, fugacity [fyoo-gas-i-tee] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To fugacity
World English Dictionary
fugacious (fjuːˈɡeɪʃəs)
1.  passing quickly away; transitory; fleeting
2.  botany lasting for only a short time: fugacious petals
[C17: from Latin fugax inclined to flee, swift, from fugere to flee; see fugitive]

fugacity (fjuːˈɡæsɪtɪ)
1.  thermodynamics Also called: escaping tendency, f a property of a gas, related to its partial pressure, that expresses its tendency to escape or expand, given by d(logef) = dμ/RT, where μ is the chemical potential, R the gas constant, and T the thermodynamic temperature
2.  the state or quality of being fugacious

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Word Origin & History

1630s, from L. fugaci-, stem of fugax, from fugere "to flee" (see fugitive).
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
American Heritage
Medical Dictionary

fugacity fu·gac·i·ty (fyōō-gās'ĭ-tē)
A measure of the tendency of a substance, often a fluid, to move from one phase to another or from one site to another.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Encyclopedia Britannica


a measure of the tendency of a component of a liquid mixture to escape, or vaporize, from the mixture. The composition of the vapour form of the mixture, above the liquid, is not the same as that of the liquid mixture; it is richer in the molecules of that component that has a greater tendency to escape from the liquid phase. The fugacity of a component in a mixture is essentially the pressure that it exerts in the vapour phase when in equilibrium with the liquid mixture.

Learn more about fugacity with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
The submitter needs to provide the input values used in its fugacity calculations.
Furthermore, fugacity modeling predicts minimal distribution to the air phase.
Related Words
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature