Definition of fax-back in English:

fax-back

Pronunciation /ˈfaksbak/

See synonyms for fax-back

noun

Telecommunications
  • 1A service that can fax a document automatically on request, in response to the fax number (and sometimes other details) being entered into a database by telephone or email; a message or document faxed in this way.

    A trademark in the U.S.

  • 2A questionnaire or similar document inviting a response by fax; such a response.

Origin

1980s; earliest use found in PR Newswire. From fax + back, after callback.