One of twenty-one equal parts of a whole, usually written .
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(informal) A party to celebrate a twenty-first birthday.
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Twenty-first Sentence Examples
At the time of the prince consort's death the prince of Wales was in his twenty-first year.
the twenty-first letter of the Phoenician alphabet, is one of the four sibilants which that alphabet possesses.
South-western Arabia, from the twenty-first parallel down to the Gulf of Aden, including the Taif district of Hejaz, Asir and Yemen, South forms one province geographically.
Grant was the best horseman of his class, and took a respectable place in mathematics, but at his graduation in 1843 he only ranked twenty-first in a class of thirty-nine.
A bridge was first constructed here in the twenty-first year of the Peloponnesian War, when Euboea revolted from Athens; and thus the Boeotians, whose work it was, contrived to make that country "an island to every one but themselves."