thirty-third I. \| ̷ ̷ ̷ ̷| ̷ ̷\adjective 1.: being number 33 in a countable series < the thirty-third day > — see number table 2.: being one of 33 equal parts into which anything is divisible < a thirty-third share of the money > II. noun 1.: number 33 in a countable series 2.: the quotient of a unit divided by 33 : one of 33 equal parts of anything < one thirty-third of the total >