/ əˈkʌmpəni; NAmE / verb ( ac·com·pan·ies , ac·com·pany·ing , ac·com·pan·ied , ac·com·pan·ied ) [ vn ]
1.
( formal ) to travel or go somewhere with sb :
His wife accompanied him on the trip.
2.
to happen or appear with sth else :
strong winds accompanied by heavy rain
Each pack contains a book and accompanying CD.
3.
accompany sb (at / on sth) to play a musical instrument, especially a piano, while sb else sings or plays the main tune :
The singer was accompanied on the piano by her sister.
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WORD ORIGIN
late Middle English : from Old French accompagner , from a- (from Latin ad to, at) + compagne , from Old French compaignon companion. The spelling change was due to association with company .