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Definition of ninety:

  1. A symbol representing ninety units, as 90 or xc.
  2. Nine times ten; eighty- nine and one more; as, ninety men.
  3. The sum of nine times ten; the number greater by a unit than eighty- nine; ninety units or objects.


cardinal, fifty, cardinal number, eighty, crore, eight, five, eleven, eighteen, fifteen, 90, xc, billion.

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