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A distribution describing the time between events in a Poisson process; a continuous analogue of the geometric distribution.

Anything related to the exponential probability distribution, i.e. a continuous probability distribution whose probability density function is a one-sided decreasing exponential function:

$f(x) = ke^{-kx}$        if $x >= 0$

$f(x) = 0$                 if $x < 0$

where $k$ is a constant.