Definitions from Wiktionary (time constant)

▸ noun:  (mathematics) A characteristic of an exponential function, represented by τ in the function:
▸ noun:  (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.
▸ noun:  For radioactivity: the decay constant.
▸ Also see time_constant


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