■ ordinal number
1》 constituting number seven in a sequence; 7th.
2》 ( a ~/one ~ ) each of seven equal parts into which something is or may be divided.
3》 Music an interval spanning seven consecutive notes in a diatonic scale.
↘the note which is higher by this interval than the tonic of a diatonic scale or root of a chord.
↘a chord in which the ~ note of the scale forms an important component.
Derivatives
~ly adverb