accompaniment in WordNet English dictionary

1. the act of accompanying someone or something in order to protect them
   escort  accompaniment 
   
2. 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"
   complement  accompaniment 
   
3. a musical part (vocal or instrumental) that supports or provides background for other musical parts
   accompaniment  musical accompaniment  backup  support 
   
4. an event or situation that happens at the same time as or in connection with another
   accompaniment  concomitant  attendant  co-occurrence