Search Result for "harmonic mean":
Wordnet 3.0

NOUN (1)

1. the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers; 



WordNet (r) 3.0 (2006):

harmonic mean
    n 1: the mean of n numbers expressed as the reciprocal of the
         arithmetic mean of the reciprocals of the numbers