mediant Meaning, Definition & Usage

  1. noun (music) the third note of a diatonic scale; midway between the tonic and the dominant

WordNet

Me"di*ant noun
Etymology
L. medians, p. p. of mediare to halve: cf. It. mediante, F. médiante.
Definitions
  1. (Mus.) The third above the keynote; -- so called because it divides the interval between the tonic and dominant into two thirds.

Webster 1913