seventh UK /ˈsɛvnθ/US /ˈsɛvənθ/adjective 1noun 3forms 1 adjective1 •coming after six others in a row, a list or a series[T]he law codes drafted in Athens in the late seventh and early sixth centuries were the work of individuals, Drakon and then Solon. — 1976 noun3 •The person or thing in the seventh position.He departs with the significant announcement that he will post at the gates six defenders, with himself as the seventh. — 1924 •One of seven equal parts of a whole. •A tone of the seventh degree from a given tone, the interval between two such tones, or the two tones sounding in unison. formssevenths