caller ID

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caller ID (countable and uncountable, plural caller IDs)

  1. (countable) The telephone number and/or name of the originator of an incoming telephone call, displayed on the screen of the telephone or other electronic device receiving the call.
  2. (uncountable) The service of providing such information, sometimes included in one's standard telephone contract and sometimes available for an extra fee.
    • 1991 Nov. 11, Richard Lacayo, "Now We've Really Got Your Number," Time (retrieved 20 May 2014):
      The new phone service known as Caller I.D. is a double-edged sword: it protects the privacy of some people, but at the expense of others.