golden ratio

World English Dictionary
golden ratio
 
n
Compare golden section Φ 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)

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Dictionary.com's 21st Century Lexicon
Main Entry:  golden ratio
Part of Speech:  n
Definition:  the value (1 + sqrt(5)) / 2, which is approximately 1.6180339887, the ratio of a diagonal of a pentagon to its side; also called golden ratio, golden section, golden number, divine proportion
Example:  The golden ratio is used to give proportions of height to width when laying out text and illustrations.
Main Entry:  golden ratio
Part of Speech:  n
Definition:  See golden ratio
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