parametric equations

parametric equation

noun Mathematics.
one of two or more equations expressing the location of a point on a curve or surface by determining each coordinate separately.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
parametric equations
pl n
a set of equations expressing a number of quantities as explicit functions of the same set of independent variables and equivalent to some direct functional relationship of these quantities: a circle x²+y²=r² has parametric equations x=r cos θ and y=r sin θ in terms of the parameters r and θ

Collins English Dictionary - Complete & Unabridged 10th Edition
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