Pronunciation: /ˈkɔːlbak/
noun
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1chiefly North American an invitation to return for a second audition or interview: he was one of only twelve applicants to receive a callback
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2a telephone call made to return one that someone has received.
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3 [mass noun] a security feature used by some computer systems accessed by telephone, in which a user must log on from a previously registered phone number, to which the system then places a return call.