instantaneous

Etymology

From New Latin īnstāntāneus, from Latin īnstantem.

adj

1. Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time.
   This instantaneous motion is supposed by you, to be infinitely swift. 1631, William Twisse, chapter VI, in A Discovery of D. Iacksons vanitie, page 223
   The penis is the perfectly obvious and natural symbol of instantaneous time. 1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 129
   He said that the bullet went through her head, severed her spine and death would have been almost instantaneous. 2007-05-30, “Spector jury given graphic account of actress ‘murder’”, in The Times, London, retrieved 2007-07-13