time constant

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English

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Noun

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time constant (plural time constants)

  1. (mathematics) A characteristic of an exponential function, represented by τ in the function:
    .
  2. (physics) The time in which a physical system's response to a step-wise change in an external variable reaches approximately 63% of its final (asymptotic) value.
  3. For radioactivity: the decay constant.

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