# Thirty vs. Forty — What's the Difference?

## Compare with Definitions

#### Thirty

The cardinal number equal to 3 × 10.
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#### Forty

The cardinal number equal to 4 × 10.
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#### Thirty

A decade or the numbers from 30 to 39
They settled down in their thirties. The temperature fell into the thirties.
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#### Forty

A decade or the numbers from 40 to 49
They stopped smoking in their forties. At night the temperature fell into the forties.
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#### Thirty

Often Thirties The decade from 30 to 39 in a century.
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#### Forty

Often Forties The decade from 40 to 49 in a century.
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#### Thirty

An indication of the end of a news story, usually written 30.
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#### Forty

The cardinal number occurring after thirty-nine and before forty-one.
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#### Thirty

(Sports) The second point that is scored by one side in tennis.
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#### Forty

(slang) A bottle of beer containing forty fluid ounces.
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#### Thirty

The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.
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#### Forty

Four times ten; thirty-nine and one more.
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#### Thirty

(slang) A rack of thirty beers.
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#### Forty

The sum of four tens; forty units or objects.
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#### Thirty

Being three times ten; consisting of one more than twenty-nine; twenty and ten; as, the month of June consists of thirty days.
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#### Forty

A symbol expressing forty units; as, 40, or xl.
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#### Thirty

The sum of three tens, or twenty and ten; thirty units or objects.
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#### Forty

The cardinal number that is the product of ten and four
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#### Thirty

A symbol expressing thirty, as 30, or XXX.
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#### Forty

Being ten more than thirty
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#### Thirty

The cardinal number that is the product of ten and three
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#### Thirty

Being ten more than twenty
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