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caller ID

[kaw-ler] /ˈkɔ lər/
a telephone service that allows a subscriber to identify a caller before answering by displaying the caller's telephone number on a small screen.
1985-90 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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caller ID in Technology

(CID) A short piece of text transmitted by some telephone systems describing the origin of a call, e.g. the name of the caller. Some telephone handsets can display this. A computer telephony integration system might use it to trigger actions on the callee's computer such as looking up the caller in a database and displaying their details on screen.
There may also be a separate "caller id number" giving the telephone number of the originator of the call.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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