2 definitions found From WordNet (r) 2.0 [wn]: mediant noun: (music) the third note of a diatonic scale; midway between the tonic and the dominant From The Collaborative International Dictionary of English v.0.44 [gcide]: Mediant \Me"di*ant\, noun [L. medians, p. p. of mediare to halve: cf. It. mediante, F. m['e]diante.] (Mus.) The third above the keynote; -- so called because it divides the interval between the tonic and dominant into two thirds.

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