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

  

twelve

 number
number
BrE BrE//twelv//
 
; NAmE NAmE//twelv//
 
 
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12 Word Origin Old English twelf(e), from the base of two + a second element (probably expressing the sense ‘left over’); of Germanic origin and related to Dutch twaalf and German zwölf. Compare with eleven.
See the Oxford Advanced American Dictionary entry: twelve