Online Google Dictionary

rapidity 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/rəˈpidətē/,
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rapidities, plural;
  1. The quality of moving or reacting with great speed
    • - the fish sink into the sand with such rapidity that it must be seen to be believed
  2. The fact of happening at a great rate; swiftness
    • - technology spreads with extraordinary rapidity
  1. celerity: a rate that is rapid
  2. In relativity, rapidity is an alternative to speed as a framework for measuring motion. On parallel velocities (say, in one-dimensional space) rapidities are simply additive, unlike speeds at relativistic velocities. ...
  3. speed, swiftness; the condition of being rapid; A measure of velocity relative to the speed of light; A measure of the velocity of a particle in a beam relative to the beam#s axis
  4. Logarithmic ratio given by