#time_constant.time_interval__timeconstant  (electronics) the time required for the current or voltage in a circuit to rise or fall exponentially through approximately 63 per cent of its amplitude
  supertype:  time_interval__interval  a definite length of time marked off by two instants
  subtype:  relaxation_time__relaxationtime  the time constant of an exponential return of a system to equilibrium after a disturbance

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