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English definition of “900 number”

900 number

noun [C]     /ˌnaɪnˈhʌn.drədˌnʌm.bər/ US  /-bɚ/
in the US, an expensive phone number that begins with 900 , provided by companies offering services such as chatlines Communicating by telephone
(Definition of 900 number noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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