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Definition of 800 number noun from the Oxford Advanced American Dictionary

 

800 number

 noun
noun
NAmE//ˌeɪt ˈhʌndrəd ˌnʌmbər//
 
 
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a phone number that begins with 800. An 800 number is provided by businesses for customers to call them free of charge Does the electric company have an 800 number?
See the Oxford Advanced Learner's Dictionary entry: 800 number