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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The result of this method is the partial derivative of species concentrations with respect to minute changes in emissions.
The word del describes either of two mathematical terms: an operator or a partial derivative.
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