compander Syllabification: (com·pand·er)Pronunciation: /kəmˈpandər/ (also compandor)Definition of compander noun a device that improves the signal-to-noise ratio of an electrical signal by compressing the range of amplitudes of the signal before transmission, and then expanding it on reproduction or reception. Origin: 1930s: blend of compressor and expander (see expand)compander in other Oxford dictionaries Definition of compander in the British & World English dictionary