Hypertext Webster Gateway: "mediant"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Mediant \Me"di*ant\, n. [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.
From WordNet (r) 1.7 (wn)
mediant
n : (music) the third note of a diatonic scale; midway between
the tonic and the dominant
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