I. noun 1. a musical part which supports or partners an instrument, voice, or group • she sang to a guitar accompaniment
• [ mass noun]
sonatas for piano with violin accompaniment.
2. a piece of music played as a complement or background to an activity • lush string accompaniments to romantic scenes in films
• we filed out to the accompaniment of the organ.
3. something that supplements or complements something else • these biscuits are a lovely accompaniment to tea.
– origin early 18th cent.: from French accompagnement, from accompagner ‘accompany’.