thirty-third adjective 1noun 1forms 1 adjective1 •The ordinal form of the number thirty-three, describing a person or thing in position number 33 of a sequence.The answer appears on the thirty-third page of the book.She finished thirty-third in the race. noun1 •One of thirty-three equal parts of a whole.A thirty-third of 660 is 20. formsthirty-thirds
