seventh

The ordinal number matching the number seven in a series.

One of seven equal parts.

An interval encompassing seven diatonic degrees.

Last in order of a series of seven; preceded by six of the same kind; next in order after that which is sixth: an ordinal numeral.

Constituting or being one of seven equal parts into which a whole may be divided: as, the seventh part.

One next in order after the sixth.

The quotient of unity divided by seven; one of seven equal parts into which a whole is divided.

In music:

A tone on the seventh degree above or below a given tone; the next tone to the octave.

The interval between any tone, and a tone on the seventh degree above or below it.