1. (noun)accompaniment, concomitant, attendant, co-occurrence an event or situation that happens at the sametime as or in connection with another
2. (noun)accompaniment, musical accompaniment, backup, support a musicalpart (vocal or instrumental) that supports or provides background for other musicalparts
3. (noun)complement, accompaniment something added to complete or embellish or makeperfect "a fine wine is a perfect complement to the dinner"; "wild rice was served as an accompaniment to the main dish"
4. (noun)escort, accompaniment the act of accompanying someone or something in order to protect them