seventy-seventh I. \| ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷\adjective 1.: being number 77 in a countable series < the seventy-seventh day > — see number table 2.: being one of 77 equal parts into which something is divisible < a seventy-seventh share of the money > II. noun 1.: number 77 in a countable series 2.: the quotient of a unit divided by 77 : one of 77 equal parts of something < one seventy-seventh of the total >