a. A group of singers who perform together, usually singing multi-part compositions with more than one singer for each part.

b. A group of vocalists and dancers who support the soloists and leading performers in operas, musical comedies, and revues.

a. A musical composition usually in four or more parts written for a large number of singers.

b. A refrain in a song, especially one in which the soloist is joined by other performers or audience members.

c. A solo section based on the main melody of a popular song and played by a member of the group.

a. A group of persons who speak or sing in unison a given part or composition in drama or poetry recitation.

b. An actor in Elizabethan drama who recites the prologue and epilogue to a play and sometimes comments on the action.

a. A group in a classical Greek drama whose songs and dances present an exposition of or, in later tradition, a disengaged commentary on the action.

b. The portion of a classical Greek drama consisting of choric dance and song.

a. A speech, song, or other utterance made in concert by many people.

b. A simultaneous utterance by a number of people: a chorus of jeers from the bystanders.

c. A simultaneous production of sound by numerous animals: the midday chorus of cicadas.

d. A simultaneous production of sound by numerous inanimate objects: a chorus of lawnmowers from the neighborhood's backyards.