English

Definition of box number noun from the Oxford Advanced Learner's Dictionary

 

box number

 noun
noun
BrE BrE//ˈbɒks nʌmbə(r)//
 
; NAmE NAmE//ˈbɑːks nʌmbər//
 
(also box)
 
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a number used as an address, especially one given in newspaper advertisements to which replies can be sent
See the Oxford Advanced American Dictionary entry: box number