WordReference Random House Unabridged Dictionary of American English © 2026
eight•y-first
(ā′tē fûrst′),USA pronunciation adj.
n.
- next after the eightieth;
being the ordinal number for 81. - being one of 81 equal parts.
n.
- an eighty-first part, esp. of one (1⁄81).
- the eighty-first member of a series.
'eighty-first' also found in these entries (note: many are not synonyms or translations):