WordReference Random House Unabridged Dictionary of American English © 2025
twen•ty-first
(twen′tē fûrst′, twun′-),USA pronunciation adj.
n.
- next after the twentieth;
being the ordinal number for 21. - being one of 21 equal parts.
n.
- a twenty-first part, esp. of one (1⁄21).
- the twenty-first member of a series.
'twenty-first' also found in these entries (note: many are not synonyms or translations):