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A time which represents the speed with which a particular system can respond to change, typically equal to the time taken for a specified parameter to vary by a factor of 1−1/e (approximately 0.6321).
- ‘The time constant of the signal-recovery process yields information on potential heart damage.’
- ‘This time constant, like that for the half-life of a radionuclide, doesn't tell you an age necessarily - assumptions must be applied first.’
- ‘This time constant reflects, rather, the lifetime of the first excited singlet state of the complex, which decays rapidly owing to intersystem crossing.’
- ‘One way is to vary the time constant of the slow negative-feedback variable.’
- ‘The hyperinflation may be explained completely by the time constant of the respiratory system exceeding the time available for tidal exhalation.’
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The definitions of ‘buddy’ and ‘bro’ in the OED have recently been revised. We explore their history and increase in popularity.