Instantaneous

New Latin, 17th century

Full definition of instantaneous

Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time.

1631, William Twisse, A discovery of D. Iacksons vanitie, ch. 6, p. 223,This instantaneous motion is supposed by you, to be infinitely swift.
1766, Oliver_Goldsmith, The Vicar of Wakefield, ch. 14.However, no lovers in romance ever cemented a more instantaneous friendship.
1813, Jane_Austen, Pride and Prejudice, ch. 57,The colour now rushed into Elizabeth's cheeks in the instantaneous conviction of its being a letter from the nephew.
1907, Joseph_Conrad, The Secret Agent, ch. 4,It's the principle of the pneumatic instantaneous shutter for a camera lens.
2007, Spector jury given graphic account of actress 'murder' Times Online, London, 30 May (retrieved 13 July 2007),He said that the bullet went through her head, severed her spine and death would have been almost instantaneous.