instantaneous

• POS: Adjective
• HYPHEN: in=stan=ta=ne=ous

CIDE DICTIONARY

instantaneous, a. [Cf. F. instantané.].

•  Done or occurring in an instant, or without any perceptible duration of time; as, the passage of electricity appears to be instantaneous.  [1913 Webster]

  "His reason saw
  With instantaneous view, the truth of things."  [1913 Webster]
•  At or during a given instant; as, instantaneous acceleration, velocity, etc.  [1913 Webster]

Instantaneous center of rotation (Kinematics), in a plane or in a plane figure which has motions both of translation and of rotation in the plane, is the point which for the instant is at rest. -- Instantaneous axis of rotation (Kinematics), in a body which has motions both of translation and rotation, is a line, which is supposed to be rigidly united with the body, and which for the instant is at rest. The motion of the body is for the instant simply that of rotation about the instantaneous axis.

OXFORD DICTIONARY

instantaneous, adj.
1 occurring or done in an instant or instantly.
2 Physics existing at a particular instant.

Derivative

instantaneity n. instantaneously adv. instantaneousness n.

Etymology

med.L instantaneus f. L instans (as INSTANT) after eccl.L momentaneus

THESAURUS

instantaneous

alert, apt, brief, compact, compendious, concise, curt, curtal, curtate, decisive, decurtate, expeditious, fast, hair-trigger, immediate, instant, lightning-like, little, low, momentaneous, momentary, presto, prompt, punctual, quick, quick as lightning, quick as thought, rapid, ready, short, short and sweet, speedy, spontaneous, succinct, summary, swift, synoptic, transient, transitory

ROGET THESAURUS

instantaneous

Transientness

N transience, transientness, evanescence, impermanence, fugacity, caducity, mortality, span, nine days' wonder, bubble, Mayfly, spurt, flash in the pan, temporary arrangement, interregnum, velocity, suddenness, changeableness, transient, transient boarder, transient guest, transient, transitory, transitive, passing, evanescent, fleeting, cursory, short-lived, ephemeral, flying, fugacious, fugitive, shifting, slippery, spasmodic, instantaneous, momentaneous, temporal, temporary, provisional, provisory, deciduous, perishable, mortal, precarious, unstable, insecure, impermanent, brief, quick, brisk, extemporaneous, summary, pressed for time, sudden, momentary, temporarily, pro tempore, for the moment, for a time, awhile, en passant, in transitu, in a short time, soon, briefly, at short notice, on the point of, on the eve of, in articulo, between cup and lip, one's days are numbered, the time is up, here today and gone tomorrow, non semper erit aestas, eheu! fugaces labuntur anni, sic transit gloria mundi, a schoolboy's tale, the wonder of the hour!, dum loquimur fugerit invidia aetas, fugit hora, all that is transitory is but an illusion.

Instantaneity

N instantaneity, instantaneousness, immediacy, suddenness, abruptness, moment, instant, second, minute, twinkling, trice, flash, breath, crack, jiffy, coup, burst, flash of lightning, stroke of time, epoch, time, time of day, time of night, hour, minute, very minute, very time, very hour, present time, right time, true time, exact correct time, instantaneous, momentary, sudden, immediate, instant, abrupt, discontinuous, precipitous, precipitant, precipitate, subitaneous, hasty, quick as thought, quick as lightning, quick as a flash, rapid as electricity, speedy, quick, fast, fleet, swift, lively, blitz, rapid (velocity), instantaneously, in no time, in less than no time, presto, subito, instanter, suddenly, at a stroke, like a shot, in a moment, in the blink of an eye, in the twinkling of an eye, in a trice, in one's tracks, right away, toute a l'heure, at one jump, in the same breath, per saltum, uno saltu, at once, all at once, plump, slap, at one fell swoop, at the same instant, immediately, extempore, on the moment, on the spot, on the spur of the moment, no sooner said than done, just then, slap-dash, touch and go, no sooner said than done.