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Taylor's series

noun
  1. maths an infinite sum giving the value of a function f(z) in the neighbourhood of a point a in terms of the derivatives of the function evaluated at a. Under certain conditions, the series has the form f (z) = f (a) + [ f ′(a)(za)]/1! + [ f ″(a)(za)²]/2! + …See also Maclaurin's series
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Word Origin

C18: named after Brook Taylor (1685–1731), English mathematician
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