twenty is one of the 1000 most common headwords.
twelve - twenty - two
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English numbers (edit)
200
 ←  10  ←  19 20 21  →  30  → 
2
    Cardinal: twenty
    Ordinal: twentieth

Pronunciation

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Determiner

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Determiner
twenty

  1. (number) (indefinite) (plural) (count) (ordinal twentieth) The number 20.
    I was in university when I was twenty years old.

Singular
twenty

Plural
twenties

 
A twenty
  1. (informal) A twenty is a 20 dollar bill.
    I'd like my $50 as 1 twenty, 2 tens and 2 fives.
  2. (slang) "Twenty" is short for 10-20, meaning location.
    Jason, what's your twenty?