From The Collaborative International Dictionary of English v.0.44 [gcide]:
Instantaneous \In'stan*ta"ne*ous\, adjective [Cf. F. instantan['e].]
1. Done or occurring in an instant, 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.
2. At or during a given instant; as, instantaneous acceleration, velocity, etc.
{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}, adverb -- {In'stan*ta"ne*ous*ness}, noun
From WordNet (r) 2.0 [wn]:
noun
1: the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication" [syn: {immediacy}, {immediateness}, {instancy}]
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