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  1. thirty
    ˈthər-tē
    noun
    plural thirties
    1. a number equal to three times 10
    2. the numbers 30 to 39the years 30 to 39 in a lifetime or century
    3. a sign of completion : end
      wrote thirty on the last page of the story
    4. the second point scored by a side in a game of tennis
  2. WEB3 days ago · Learn the meaning, pronunciation and origin of the number 30 in English. Find out how to use thirty in sentences, idioms and expressions, and compare it with other languages.