bass1 Syllabification: (bass)Pronunciation: /bās/Translate bass | into French | into German | into Italian | into Spanish Definition of bass noun a voice, instrument, or sound of the lowest range, in particular. the lowest adult male singing voice. [as modifier] denoting the member of a family of instruments that is the lowest in pitch:a bass clarinet a bass drum a bass guitar or double bass. the low-frequency output of a radio or audio system, corresponding to the bass in music. Origin: late Middle English: alteration of base2, influenced by bassobass in other Oxford dictionaries Definition of bass in the British & World English dictionary