1) Musical note 2) Note 3) Tone 1) Superdominant 
In music, the submediant is the sixth scale degree of the diatonic scale, the `lower mediant` halfway between the tonic and the subdominant or `lower dominant`. It is also the third factor of the subdominant (IV) triad. It is occasionally called superdominant, {fact|date=March 2013} being above the dominant. In music theory, the submediant cho...
• (n.) The sixth tone of the scale; the under mediant, or third below the keynote; the superdominant.
The note or chord on The sixth degree of The major scale. this is Often marked with The Roman numeral VI
Sub·me'di·ant noun (Mus.) The sixth tone of the scale; the under mediant, or third below the keynote; the superdominant. 
In music, the submediant is the sixth tone of the scale; the under mediant, or third below the keynote; the superdominant.
[n] - (music) the sixth note of a major or minor scale (or the third below the tonic)
noun (music) the sixth note of a major or minor scale (or the third below the tonic)
the sixth note of a diatonic scale and the chord built on that note.
the sixth tone of a diatonic scale, being midway between the subdominant and the upper tonic. Also called