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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.

Synonyms:

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

Usage examples:

• I shall, as I think I told you, be worth about thirty dollars when the month is out. - "A Damaged Reputation", Harold Bindloss.
• You, too, have lost a son, so you know now how he has felt for thirty- two years. - "The Awakening of Helena Richie", Margaret Deland.
• Thirty men live in the drawing- room. - "The First Hundred Thousand", Ian Hay.