thirty

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thirty is one of the 1000 most common headwords.
thirty

[change] Pronunciation

[change] Determiner

(number) (ordinal thirtieth)

  1. The number 30.
    I had my first child when I was thirty years old.

[change] Noun

Singular
thirty

Plural
thirties
  1. The number 30.
    Three tens is thirty.
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