n. [ L. medians, p. p. of mediare to halve: cf. It. mediante, F. médiante. ] (Mus.) The third above the keynote; -- so called because it divides the interval between the tonic and dominant into two thirds. [ 1913 Webster ]
n. (Mus.) The sixth tone of the scale; the under mediant, or third below the keynote; the superdominant. [ 1913 Webster ]