Definition of: seventh

(sev′ənth) adjective
1. Next in order after the sixth.
2. Being one of seven equal parts.
—noun
1. One of seven equal parts; the quotient of a unit divided by seven.
2. A seventh object or unit.
3. Music a The interval between any note and the seventh note above it on the diatonic scale, counting the starting point as one. b A note separated by this interval from any other, considered with reference to that other; specifically, the seventh above the keynote. c Two notes at this interval written or sounded together. d The resulting dissonance. See INTERVAL (def. 5).
—adverb In the seventh order, place, or rank: also, in formal discourse, sev′enth·ly. [ME seventhe <SEVEN + -TH, replacing OE seofande and seofotha]