Next after the seventh: an ordinal numeral.
noun.
The quotient of unity divided by eight; one of eight equal parts of anything.
noun.
In music: The interval between any tone and a tone on the eighth diatonic degree above or below it; an octave.
noun.
A tone distant by an eighth or octave from a given tone; an octave or replicate. The eighth tone of a scale is really the prime or key-note of a replicate scale.
noun.
An eighth-note.
noun.
In early English law, an eighth part of the rents for the year, or of movables, or both, granted or levied by way of tax.