- transience, transiency, transitoriness - an impermanence that suggests the inevitability of ending or dying
--1 is a kind of impermanence, impermanency
--1 has particulars:fugacity, fugaciousness; ephemerality, ephemeralness, fleetingness - brevity, briefness, transience - the attribute of being brief or fleeting
--2 is a kind of duration, length