harmonic mean

WordReference Random House Unabridged Dictionary of American English © 2025

harmon′ic mean′, [Statistics.]

1. Statistics the mean obtained by taking the reciprocal of the arithmetic mean of the reciprocals of a set of nonzero numbers.

• 1880–85

Collins Concise English Dictionary © HarperCollins Publishers::

harmonic mean noun

1. the reciprocal of the arithmetic mean of the reciprocals of a set of specified numbers: the harmonic mean of 2, 3, and 4 is 3( + + )^–1 = 3