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Reference.org
Time derivative
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<p>A time derivative is a <a href="/facts/Derivative/7Ito70Dh">derivative</a> of a function with respect to <a href="/facts/Time/3ShdpqLx">time</a>, usually interpreted as the rate of change of the value of the function. The variable denoting time is usually written as t {\displaystyle t} . </p>