eighty-seventh /ˌeɪti ˈsɛvənθ/adjective 1noun 1forms 1 adjective1 •The ordinal form of the number eighty-seven, describing a person or thing in position number 87 of a sequence.The answer appears on the eighty-seventh page of the book.She finished eighty-seventh in the race. noun1 •One of eighty-seven equal parts of a whole.An eighty-seventh of 1740 is 20. formseighty-sevenths