eighty-seventh I. \| ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷\adjective 1.: being number 87 in a countable series < the eighty-seventh day > — see number table 2.: being one of 87 equal parts into which something is divisible < an eighty-seventh share of the money > II. noun 1.: number 87 in a countable series 2.: the quotient of a unit divided by 87 : one of 87 equal parts of something < one eighty-seventh of the total >