Sixth

a. [A-S. sixta, sexta.]

1. First after the fifth; next in order after the fifth;—the ordinal of six.
2. Constituting, or being, one of six equal parts into which any thing is divided.

1. The quotient of a unit divided by six; one of six equal parts.
2. The next in order after the fifth.
3. (Mus.) The interval of four tones and a semitone, embracing six diatonic degrees of the scale.