fifty-seventh /ˌfɪfti ˈsɛvənθ/adjective 1noun 1forms 1 adjective1 •The ordinal form of the number fifty-seven, describing a person or thing in position number 57 of a sequence.The answer appears on the fifty-seventh page of the book.She finished fifty-seventh in the race. noun1 •One of fifty-seven equal parts of a whole.A fifty-seventh of 1140 is 20. formsfifty-sevenths