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golden ratio

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noun
the ratio of two lengths, equal in value to (1 + √5)/2, and given by b / a = (b + a)/ b; it is the reciprocal of the golden section and also equal to (1 + golden section)Symbol: Φ Compare golden section
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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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