in·stan·ta·ne·ous ( n st n-t  n -s)adj. 1. Occurring or completed without perceptible delay: Relief was instantaneous. 2. Done or made as quickly or directly as possible: an instantaneous reply to my letter. 3. Present or occurring at a specific instant: instantaneous velocity; instantaneous pressure. [From Medieval Latin  nstantneus, from Latin nstns, nstant-, present; see instant.]in·stan ta·nei·ty (n-st nt-n-t, nstn-) n.in stan·tane·ous·ly adv.in stan·tane·ous·ness n. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | instantaneousness - the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication" |
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