eighty-fifth /ˌeɪti ˈfɪ(f)θ/adjective 1noun 1forms 1 adjective1 •The ordinal form of the number eighty-five, describing a person or thing in position number 85 of a sequence.The answer appears on the eighty-fifth page of the book.She finished eighty-fifth in the race. noun1 •One of eighty-five equal parts of a whole.An eighty-fifth of 1700 is 20. formseighty-fifths