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English definition of “900 number”

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900 number

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