sixty-first I. \| ̷ ̷ ̷ ̷| ̷ ̷\adjective 1.: being number 61 in a countable series < the sixty-first day > — see number table 2.: being one of 61 equal parts into which something is divisible < a sixty-first share of the money > II. noun 1.: number 61 in a countable series 2.: the quotient of a unit divided by 61 : one of 61 equal parts of something < one sixty-first of the total >