sixty-fifth I. \| ̷ ̷ ̷ ̷| ̷ ̷\adjective 1.: being number 65 in a countable series < the sixty-fifth day > — see number table 2.: being one of 65 equal parts into which something is divisible < a sixty-fifth share of the money > II. noun 1.: number 65 in a countable series 2.: the quotient of a unit divided by 65 : one of 65 equal parts of something < one sixty-fifth of the total >