Definition:Derivative/Higher Derivatives/Order of Derivative
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The order of a derivative is the number of times it has been differentiated.
- a first derivative is of first order, or order $1$
- a second derivative is of second order, or order $2$
and so on.
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): order: 1. (of a derivative)