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noun.
1. anything that goes along with something else; something added.
△Ex. Cranberry sauce is a usual accompaniment to turkey. The rain was an unpleasant accompaniment to our ride.
(SYN) concomitant, appendage.
2. (Music.) a vocal or instrumental part that helps or enriches the main part; a subsidiary instrumental or vocal part to sustain a voice or voices or a solo instrument.
△Ex. She sang to a violin and piano accompaniment.