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.n. One next in order after the sixth.n. The quotient of unity divided by seven; one of seven equal parts into which a whole is divided.n. In music:n. A tone on the seventh degree above or below a given tone; the next tone to the octave.n. The interval between any tone, and a tone on the seventh degree above or below it.n. The harmonic combination of two tones at the interval thus defined.n. In a scale, the seventh tone from the bottom; the leading-tone: solmizated si, or, in the tonic sol-fa system, ti.n. In early English law, a seventh of the rents of the year, or of movables, or both, granted or levied by way of tax.