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  1. (telecommunications) Relating to activity outside of a defined telecommunications frequency band.
    • 2001, Regis J. Bates and Donald W. Gregory, Voice and Data Communications Handbook[1], page 841:
      In this additional spectrum, in-band signaling was sent down the wires outside the frequencies used for conversation. Actually, the signals were sent across the 3,500- and 3,700-Hz frequencies. Although these worked and were not in the talk path (out of the band) they were limited in the number of tones that could be sent.
  2. (telecommunications, by extension) Relating to communication on a different channel, or by a different method, from that of the primary communication channel.
  3. (computer security) Relating to communication, such as identity verification, via a method other than the primary means of accessing the software.
    • 2007, Simon Willison, Google Tech Talks: The Implications of OpenID[2]:
      One great way of solving the phishing problem is doing out-of-band authentication.


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