Definition of 411 noun from the Oxford Advanced Learner's Dictionary

     

    411

     noun
    noun
    BrE BrE//ˌfɔː wʌn ˈwʌn//
     
    ; NAmE NAmE//ˌfɔːr wʌn ˈwʌn//
     
     
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  1. 1[uncountable] the telephone number of the service that you use in the US to find out a person’s telephone number Call 411.
  2. 2the 411 [singular] (North American English, informal) the true facts about a situation or the information you need He'll give us the 411 on what to expect. Do you have the 411? Anyone got the 411 on when the next shipment will be?
See the Oxford Advanced American Dictionary entry: 411