from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry The irrational number (approximately 1·618), usually denoted by the Greek letter φ (phi), which is equal the sum of its own reciprocal and 1, or, equivalently, is such that the ratio of 1 to the number is equal to the ratio of its reciprocal to 1.


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  • See phi.

    February 28, 2007

  • In mathematics and the arts, two quantities are in the golden ratio if the ratio between the sum of those quantities and the larger one is the same as the ratio between the larger one and the smaller. The golden ratio is approximately 1.6180339887.

    phi = 1 + sqrt(5)/2

    November 19, 2007