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1. Passing away quickly; evanescent.
2. Botany Withering or dropping off early.

[From Latin fugāx, fugāc-, from fugere, to flee.]

fu·ga′cious·ly adv.
fu·gac′i·ty (-găs′ĭ-tē) n.


1. (General Physics) 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. Symbol: f
2. (Botany) the state or quality of being fugacious


the condition of being fugacious or transitory; evanescence. — fugacious, adj.
See also: Decaying
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.fugacity - the tendency of a gas to expand or escape
physical property - any property used to characterize matter and energy and their interactions
2.fugacity - the lack of enduring qualities (used chiefly of plant parts)
plant life, flora, plant - (botany) a living organism lacking the power of locomotion
transience, transiency, transitoriness - an impermanence that suggests the inevitability of ending or dying