twenty-first

adjective

Definition of twenty-first

(Entry 1 of 2)

1 : being number 21 in a countable series the twenty-first day — see Table of Numbers

2 : being one of 21 equal parts into which something is divisible a twenty-first share of the money

twenty-first

noun

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Definition of twenty-first (Entry 2 of 2)

1 : number 21 in a countable series the twenty-first of the month

2 : the quotient of a unit divided by 21 : one of 21 equal parts of something one twenty-first of the total