sixty-eighth /ˌsɪksti ˈeɪ(t)θ/adjective 1noun 1forms 1 adjective1 •The ordinal form of the number sixty-eight, describing a person or thing in position number 68 of a sequence.The answer appears on the sixty-eighth page of the book.She finished sixty-eighth in the race. noun1 •One of sixty-eight equal parts of a whole.A sixty-eighth of 1360 is 20. formssixty-eighths