the mean of n numbers expressed as the reciprocal of the arithmetic mean of the reciprocals of the numbers
a type of average (measure of central tendency) which is defined as the quotient of divided by the sum of the reciprocals of all the values in a set of numerical data (where = # of values in the data set)
In mathematics, the harmonic mean (formerly sometimes called the subcontrary mean) is one of several kinds of average. Typically, it is appropriate for situations when the average of rates is desired.