IPA: //sʌbˈmiːdiənt//
KK: /sʌbˈmiːdiənt/
The sixth note in a musical scale, which is important in music theory and composition.
In the key of C major, the submediant is the note A.
Submediant → It is formed from "sub-" (meaning under) and "mediant" (from Latin "mediantem", meaning middle). The word refers to the note that is a third below the tonic in a musical scale, thus being under the mediant or middle note.
Think of a note that is 'under' ('sub-') the 'middle' ('mediant') note in music — that's what submediant means.