Definitions from Wiktionary (out-of-band)

▸ adjective:  (telecommunications) Relating to activity outside of a defined telecommunications frequency band.
▸ adjective:  (telecommunications, by extension) Relating to communication on a different channel, or by a different method, from that of the primary communication channel.
▸ adjective:  (computer security) Relating to communication, such as identity verification, via a method other than the primary means of accessing the software.
▸ adjective:  (programming) Referring to a value returned by a function that is not in its natural range of return values, but rather signals an exception.



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