Sixth (?), a. [From Six: cf. AS. sixta, siexta.]
1.
First after the fifth; next in order after the fifth.
2.
Constituting or being one of six equal parts into which anything is divided.
© Webster 1913.
Sixth (?), n.
1.
The quotient of a unit divided by six; one of six equal parts which form a whole.
2.
The next in order after the fifth.
3. Mus.
The interval embracing six diatonic degrees of the scale.
© Webster 1913.