n. the act of accompanying someone or something in order to protect them

n. something added to complete or embellish or make perfect; "a fine wine is a perfect complement to the dinner"; "wild rice was served as an accompaniment to the main dish"

n. a musical part (vocal or instrumental) that supports or provides background for other musical parts

n. an event or situation that happens at the same time as or in connection with another

n. [something that accompanies, usually in order to improve]