eighty-fourth I. \| ̷ ̷ ̷ ̷| ̷ ̷\adjective 1.: being number 84 in a countable series < the eighty-fourth day > — see number table 2.: being one of 84 equal parts into which something is divisible < an eighty-fourth share of the money > II. noun 1.: number 84 in a countable series 2.: the quotient of a unit divided by 84 : one of 84 equal parts of something < one eighty-fourth of the total >