Source : Webster's Revised Unabridged Dictionary (1913)

Chorus \Cho"rus\, n.; pl. {Choruses}. [L., a dance in a ring, a
   dance accompanied with song; a chorus, a band of dancers and
   singers. Gr. ?. See {Choir}.]
   1. (Antiq.) A band of singers and dancers.

            The Grecian tragedy was at first nothing but a
            chorus of singers.                    --Dryden.

   2. (Gr. Drama) A company of persons supposed to behold what
      passed in the acts of a tragedy, and to sing the
      sentiments which the events suggested in couplets or
      verses between the acts; also, that which was thus sung by
      the chorus.

            What the lofty, grave tragedians taught In chorus or
            iambic.                               --Milton.

   3. An interpreter in a dumb show or play. [Obs.]

   4. (Mus.) A company of singers singing in concert.

   5. (Mus.) A composition of two or more parts, each of which
      is intended to be sung by a number of voices.

   6. (Mus.) Parts of a song or hymn recurring at intervals, as
      at the end of stanzas; also, a company of singers who join
      with the singer or choir in singer or choir in singing
      such parts.

   7. The simultaneous of a company in any noisy demonstration;
      as, a Chorus of shouts and catcalls.