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English definition of “DID”

DID

noun [U] (UK also DDI)    
COMMUNICATIONS abbreviation for Direct Inward Dial or Direct Inward Dialing: a system that allows a phone line to be connected to more than one number, so that employees or departments in an organization can have different numbers without each needing a separate phone line: With DID the telephone company can allocate a range of numbers associated with one or more phone lines.
(Definition of DID noun from the Cambridge Business English Dictionary © Cambridge University Press)
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