Definition of three number from the Oxford Advanced American Dictionary

 

three

 number
number
NAmE//θri//
 
 
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  • 3 There are examples of how to use numbers at the entry for five.
  • Idioms
    in twos and threes
     
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    two or three at a time; in small numbers People arrived in twos and threes.
    the three Rs(old-fashioned)
     
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    reading, writing, and arithmetic, thought to be the most important parts of a child's education
    two's company (, three's a crowd)(saying)
     
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    used to suggest that it is better to be in a group of only two people than have a third person with you as well
    See the Oxford Advanced Learner's Dictionary entry: three