Roget's Thesaurus: Entry 111 (Short duration)

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#111. [Short duration.] Transientness. -- N. transience, transientness &c. adj[obs].; evanescence, impermanence, fugacity[Chem], caducity[obs], mortality, span; nine days' wonder, bubble, Mayfly; spurt; flash in the pan; temporary arrangement, interregnum.

velocity &c. 274; suddenness &c. 113; changeableness &c. 149.

transient, transient boarder, transient guest [U.S.].

V. be transient &c. adj.; flit, pass away, fly, gallop, vanish, fade, evaporate; pass away like a cloud, pass away like a summer cloud, pass away like a shadow, pass away like a dream.

Adj. transient, transitory, transitive; passing, evanescent, fleeting, cursory, short-lived, ephemeral; flying &c. v.; fugacious, fugitive; shifting, slippery; spasmodic; instantaneous, momentaneous[obs].

temporal, temporary; provisional, provisory; deciduous; perishable, mortal, precarious, unstable, insecure; impermanent.

brief, quick, brisk, extemporaneous, summary; pressed for time &c. (haste) 684; sudden, momentary &c. (instantaneous) 113.

Adv. temporarily &c. adj.; pro tempore[Lat]; for the moment, for a time; awhile, en passant[Fr], in transitu[Lat]; in a short time; soon &c. (early) 132; briefly &c. adj.; at short notice; on the point of, on the eve of; in articulo; between cup and lip.

Phr. one's days are numbered; the time is up; here today and gone tomorrow; non semper erit aestas[Lat][obs]; eheu! fugaces labuntur anni[Lat]; sic transit gloria mundi[Lat]; a schoolboy's tale, the wonder of the hour! [Byron]; dum loquimur fugerit invidia aetas[Lat][obs]; fugit hora[Lat]; all that is transitory is but an illusion [Goethe].