1. the quality of being fleeting, transient, or short-lived; the tendency to disappear or fade quickly
Usage: formal or literary
2. in chemistry and thermodynamics, a measure of the tendency of a substance to escape from a solution or mixture
Usage: technical; chemistry

Examples

• The fugacity of youth is something many people reflect on as they grow older.
• The beauty of cherry blossoms lies in their fugacity; they bloom for only a brief time.
• He was struck by the fugacity of happiness in his life.
• The fugacity of the moment made her want to capture it in a photograph.
• In thermodynamics, fugacity helps predict how gases will behave in mixtures.
• The fugacity of the perfume meant its scent faded within hours.