[mee-dee-uh
nt] 
| the third degree of a major or minor musical scale. |
| me·di·ant (mē'dē-ənt) n. The third tone in a diatonic musical scale, determining the major or minor quality of the tonic chord. [Italian mediante, from Late Latin mediāns, mediant-, present participle of mediāre, to be in the middle, from Latin medius, middle; see medium.] |