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Definition of thirty:

  1. A symbol expressing thirty, as 30, or XXX.
  2. Being three times ten; consisting of one more than twenty- nine; twenty and ten; as, the month of June consists of thirty days.
  3. The sum of three tens, or twenty and ten; thirty units or objects.


cardinal number, cardinal, eighteen, fifty, eighty, eleven, xxx, five, fifteen, 30, billion, crore, eight.

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