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900 number
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noun
a telephone number preceded by the three-digit code “900,” used to provide information or entertainment for a fee charged directly to the caller's telephone bill.
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Which of the following nouns has an irregular plural form?
Origin of 900 number
First recorded in 1985–90
Words nearby 900 number
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022