Instantaneous In`stan*ta"ne*ous, a. [Cf. F. instantan['e].] [1913 Webster] 1. 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. --Thomson. [1913 Webster]

2. 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. -- {In`stan*ta"ne*ous*ly}, adv. -- {In`stan*ta"ne*ous*ness}, n. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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