American Dictionary

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Definition 900 number in American English

900 number noun

[countable] noun
/ˌnaɪn ˈhʌndrəd ˌnʌmbər/
1

in the U.S., a telephone number beginning with 900 that is expensive to use and is usually for adult entertainment services such as chat lines

Synonyms and related words
Definition 900 number in American English