seventy-ninth /ˌsɛvənti ˈnaɪnθ/adjective 1noun 1forms 1 adjective1 •The ordinal form of the number seventy-nine, describing a person or thing in position number 79 of a sequence.The answer appears on the seventy-ninth page of the book.She finished seventy-ninth in the race. noun1 •One of seventy-nine equal parts of a whole.A seventy-ninth of 1580 is 20. formsseventy-ninths