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BNC: 0 COCA: 29585
callback
noun [U] computing /ˈkɔːlbæk/
  1. a system in which a remote computer calls back the computer that has just called its number when trying to connect to the Internet, so that only the correct person can use the Internet
     Synonyms and related words
BNC: 0 COCA: 29585
BNC: 0 COCA: 29585

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