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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.
Origin of parametric equation
1905-10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for parametric equations

parametric equations

plural noun
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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