Meaning of audio response unit

au'dio response' u"nit

Pronunciation: [key]
— Computers. Computers.
  1. a device that enables a computer to give a spoken response by generating sounds similar to human speech.
  2. a similar device that selects from a vocabulary of prerecorded words. Abbr.: ARU
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.