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geometric mean

American  

noun

Mathematics.
  1. the mean of n positive numbers obtained by taking the n th root of the product of the numbers.

    The geometric mean of 6 and 24 is 12.


geometric mean British  

noun

  1. the average value of a set of n integers, terms, or quantities, expressed as the n th root of their product Compare arithmetic mean

"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

geometric mean Scientific  
  1. The positive n th root of the product of a set of n numbers. For example, the geometric mean of 2 × 3 × 6 × 8 is the 4th root of 288, or approximately 4.12.