retune Syllabification: (re·tune)Pronunciation: /rēˈt(y)o͞on/Definition of retune verb [with object] tune (something) again or differently, in particular. put (a musical instrument) back in tune or alter its pitch. tune (a radio, television, or other piece of electronic equipment) to a different frequency. retune in other Oxford dictionaries Definition of retune in the British & World English dictionary