sixty-eighth I. \| ̷ ̷ ̷ ̷| ̷ ̷\adjective 1.: being number 68 in a countable series < the sixty-eighth day > — see number table 2.: being one of 68 equal parts into which something is divisible < a sixty-eighth share of the money > II. noun 1.: number 68 in a countable series 2.: the quotient of a unit divided by 68 : one of 68 equal parts of something < one sixty-eighth of the total >