Oxford Advanced American Dictionary

Definition of three number from the Oxford Advanced Learner's Dictionary

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three

number
three pronunciation English θriː three pronunciation American θriː
 
3
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There are examples of how to use numbers at the entry for five.
Idioms

the three Rs

(old-fashioned) reading, writing and arithmetic, thought to be the most important parts of a child's education
more at in twos and threes at two