(1):
(n.) The quotient of a unit divided by seven; one of seven equal parts into which anything is divided.
(2):
(n.) One next in order after the sixth; one coming after six others.
(3):
(a.) Constituting or being one of seven equal parts into which anything is divided; as, the seventh part.
(4):
(a.) Next in order after the sixth;; coming after six others.
(5):
(n.) An interval embracing seven diatonic degrees of the scale.
(6):
(n.) A chord which includes the interval of a seventh whether major, minor, or diminished.