eighty-first

[ ey-tee-furst ]
/ ˈeɪ tiˈfɜrst /

adjective

next after the eightieth; being the ordinal number for 81.
being one of 81 equal parts.

noun

an eighty-first part, especially of one (1/81).
the eighty-first member of a series.

Example sentences from the Web for eighty-first