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[fyoo-gey-shuh s] /fyuˈgeɪ ʃəs/
fleeting; transitory:
a sensational story with but a fugacious claim on the public's attention.
Botany. falling or fading early.
Origin of fugacious
1625-35; < Latin fugāci- (stem of fugāx apt to flee, fleet, derivative of fugere to flee + -ous
Related forms
fugaciously, adverb
fugaciousness, fugacity
[fyoo-gas-i-tee] /fyuˈgæs ɪ ti/ (Show IPA),
noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for fugacity
Historical Examples
  • The best of pigments may be ruined by their injudicious use, and obtain a character for fugacity which they in no way deserve.

    Field's Chromatography George Field
  • It is so serviceable a pigment for so many purposes, especially in admixture, that its sin of fugacity is overlooked.

    Field's Chromatography George Field
  • There is no need for this cant cry of fugacity, which casts such a blight on modern art.

    Field's Chromatography George Field
  • As there are different degrees both of permanence and fugacity, so are there different degrees of semi-stability.

    Field's Chromatography George Field
  • Will they not rather spread over the picture the Upas-tree of fugacity, and kill it as they die themselves!

    Field's Chromatography George Field
British Dictionary definitions for fugacity


(thermodynamics) Also called escaping tendency. 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 f
the state or quality of being fugacious


passing quickly away; transitory; fleeting
(botany) lasting for only a short time: fugacious petals
Derived Forms
fugaciously, adverb
fugaciousness, noun
Word Origin
C17: from Latin fugax inclined to flee, swift, from fugere to flee; see fugitive
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
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Word Origin and History for fugacity



"fleeing, likely to flee," 1630s, from Latin fugaci-, stem of fugax "apt to flee, timid," figuratively "transitory, fleeting," from fugere "to flee" (see fugitive) + -ous. Related: Fugaciously; fugaciousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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fugacity in Medicine

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.
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