1. A musical composition written for a large group of singers: A sizeable and rather large chorus often involves parts for sopranos, altos, tenors, and basses.
2. A group of singers performing together: The chorus and dancers performed together in a show which was exhilarating and fantastic.
3. In ancient Greek plays, a group of actors who spoke the same words that described what was going on and commented about what was being presented: At the Greek theater, the audience watched the chorus perform during the religious festival.