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

  

three

 number
number
BrE BrE//θriː//
 
; NAmE NAmE//θriː//
 
 
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  • 3 There are examples of how to use numbers at the entry for five.
  • Word Origin Old English thrīe (masculine), thrīo, thrēo (feminine), of Germanic origin; related to Dutch drie and German drei, from an Indo-European root shared by Latin tres and Greek treis.Idioms two or three at a time; in small numbers People arrived in twos and threes. (old-fashioned) reading, writing and arithmetic, thought to be the most important parts of a child’s education
    See the Oxford Advanced American Dictionary entry: three