partial-derivative

partial derivative

noun Mathematics.
the derivative of a function with respect to one of its variables with all other variables held constant.

Origin:
1970–75

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Collins
World English Dictionary
partial derivative
 
n
the derivative of a function of two or more variables with respect to one of the variables, the other or others being considered constant. Written ∂f/∂x

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
partial derivative   (pär'shəl)  Pronunciation Key 
The derivative with respect to a single variable of a function of two or more variables, regarding other variables as constants.
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