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or without any perceptible duration of time; as, the passage of electricity appears to be instantaneous. His reason saw With instantaneous view, the truth of things. Thomson.

Happening at the same instant. C. Darwin.

An instrument for the instantaneous self-recording or printing of time. Knight.

In two figures having relative motion, one of the two curves which are the loci of the instantaneous center.

An explosion or sudden report made by the instantaneous decomposition or combustion of unstable substances' as, the detonation of gun cotton.

A contrivance for obtaining a light instantaneous, as a lucifer match. Brande & C.

A sudden burst of light; a flood of light instantaneously appearing and disappearing; a momentary blaze; as, a flash of lightning.

The single instantaneous stroke of a body in motion against another either in motion or at rest.

Quality of being instantaneous. Shenstone.

A machine, for the production of animated pictures, in which a film carrying successive instantaneous views of a moving scene travels uniformly through the field of a magnifying glass. The observer sees each picture, momentarily, through a slit in a revolving disk, and these glimpses, blended by persistence of vision,…

e voltaic arc is used as the source of light. -- Dëbereiner's lamp, an apparatus for the instantaneous production of a flame by the spontaneous ignition of a jet of hydrogen on being led over platinum sponge; -- named after the German chemist Döbereiner, who invented it. Called also philosopher's lamp. -- Flameless l…

Evolving; being evolved or produced. Nascent state (Chem.), the supposed instantaneous or momentary state of an uncombined atom or radical just separated from one compound acid, and not yet united with another, -- a hypothetical condition implying peculiarly active chemical properties; as, hydrogen in the nascent state…

e liquid, used in medicine as a depressant and a vaso-dilator. Its inhalation produces an instantaneous flushing of the face.

taste and odor; to the hearing, piercing, shrill, as a sharp sound or voice; to the eye, instantaneously brilliant, dazzling, as a sharp flash.

An instantaneous photograph made, usually with a hand camera, without formal posing of, and often without the foreknowledge of, the subject.

A line, within a rotating fluid, whose tangent at every point is the instantaneous axis of rotation as that point of the fluid.