Definition of "Chorus"

Chorus

/ˈkɔːɹəs/

proper noun
uncountable
1. (Ancient Greece, historical) A group of singers and dancers in a theatrical performance or religious festival who commented on the main performance in speech or song.
  Quotations
  Enter Chorus. / Cut is the branch that might haue growne ful ſtraight, / And burned is Apolloes Laurel bough, / That ſometime grew within this learned man: […]
  1589–1592 (date written), Ch[ristopher] Marl[owe], The Tragicall History of D. Faustus. […], London: […] V[alentine] S[immes] for Thomas Bushell, published 1604, signature [F3], recto
  Ya're as good as a Chorus my lord.
  c. 1599–1602 (date written), William Shake-speare, The Tragicall Historie of Hamlet, Prince of Denmarke: […] (First Quarto), London: […] [Valentine Simmes] for N[icholas] L[ing] and Iohn Trundell, published 1603, [Act III, scene ii]
2. (Ancient Greece, historical) A song performed by the singers of such a group.