instantaneous Meaning, Definition & Usage

  1. adjective satellite occurring with no delay
    instant.
    • relief was instantaneous
    • instant gratification

WordNet

In`stan*ta"ne*ous adjective
Etymology
Cf. F. instantané.
Definitions
  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. -- In`stan*ta"ne*ous*ly, adv. -- In`stan*ta"ne*ous*ness, n.

Webster 1913