'Fugacity' definitions:

Definition of 'fugacity'

From: WordNet
noun
The tendency of a gas to expand or escape
noun
The lack of enduring qualities (used chiefly of plant parts) [syn: fugacity, fugaciousness]

Definition of 'Fugacity'

From: GCIDE
  • Fugacity \Fu*gac"i*ty\, a. [L fugacitas: cf. F. fugacit['e].]
  • 1. The quality of being fugacious; fugaclousness; volatility; as, fugacity of spirits. --Boyle. [1913 Webster]
  • 2. Uncertainty; instability. --Johnson. [1913 Webster]