Online Google Dictionary

instantaneous 中文解釋 wordnet sense Collocation Usage Collins Definition
Adjective
/ˌinstənˈtānēəs/,
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Occurring or done in an instant or instantly,
  1. Occurring or done in an instant or instantly
    • - her reaction was almost instantaneous
  2. Operating or providing something instantly
    • - modern methods of instantaneous communication
  3. Existing or measured at a particular instant
    • - measurement of the instantaneous velocity

  1. occurring with no delay; "relief was instantaneous"; "instant gratification"
  2. (instantaneousness) immediacy: the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication"
  3. Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time
  4. [1] strikes NDH [B], PO > DS, FO up and both move slightly towards signer. (Like the MINUTE part of LAST~MINUTE.) Obviously the sign FAST will not work with "instantaneous speed", which is a common phrase in physics.