The Collaborative International Dictionary of English v.0.48:

Chorus \Cho"rus\, v. i. [imp. & p. p. Chorused; p. pr. & vb.
   n. Chorusing.]
   To sing in chorus; to exclaim simultaneously. --W. D.
   Howells.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.]
   [1913 Webster]
   1. (Antiq.) A band of singers and dancers.
      [1913 Webster]

            The Grecian tragedy was at first nothing but a
            chorus of singers.                    --Dryden.
      [1913 Webster]

   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.
      [1913 Webster]

            What the lofty, grave tragedians taught
            In chorus or iambic.                  --Milton.
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   3. An interpreter in a dumb show or play. [Obs.]
      [1913 Webster]

   4. (Mus.) A company of singers singing in concert.
      [1913 Webster]

   5. (Mus.) A composition of two or more parts, each of which
      is intended to be sung by a number of voices.
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   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.
      [1913 Webster]

   7. The simultaneous of a company in any noisy demonstration;
      as, a Chorus of shouts and catcalls.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chorus
    n 1: any utterance produced simultaneously by a group; "a chorus
         of boos"
    2: a group of people assembled to sing together
    3: the part of a song where a soloist is joined by a group of
       singers [syn: refrain, chorus]
    4: a body of dancers or singers who perform together [syn:
       chorus, chorus line]
    5: a company of actors who comment (by speaking or singing in
       unison) on the action in a classical Greek play [syn:
       chorus, Greek chorus]
    v 1: utter in unison; "`yes,' the children chorused"
    2: sing in a choir [syn: choir, chorus]

The Free On-line Dictionary of Computing (19 January 2023):

Chorus

    A distributed operating system developed
   at INRIA.

   (2006-09-20)