Eighth

Part of speech: noun (n.)

1. The quotient of a unit divided by eight; one of eight equal parts; an eighth part.

2. The interval of an octave.

Part of speech: adjective (a.)

1. Next in order after the seventh.

2. Consisting of one of eight equal divisions of a thing. Eighth note (Mus.), the eighth part of a whole note, or semibreve; a quaver.