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.
      [1913 Webster]

   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.
      [1913 Webster]

   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]

Moby Thesaurus II by Grady Ward, 1.0:

310 Moby Thesaurus words for "chorus":
   Liederkranz, Liedertafel, PS, Parthian shot, Spenserian stanza,
   a cappella, acclamation, accord, accordance, act like,
   acting company, addendum, affect, affinity, afterthought,
   agreement, agreement of all, anacrusis, anthem, antistrophe,
   appendix, articulate, assent, assume, back matter, ballad,
   bass passage, bis, bob, book, borrow, bourdon, breathe, bridge,
   burden, cadence, cantata, canto, carol, cast, cast of characters,
   chamber chorus, chant, characters, chime, chirp, chirrup, choir,
   choral group, choral singing, choral society, choral symphony,
   chorale, circus troupe, coda, codicil, coherence, coincidence,
   colophon, come out with, common assent, common consent,
   communicate, company, compatibility, concert, conclusion, concord,
   concordance, concurrence, conformance, conformation, conformity,
   congeniality, congruence, congruency, congruity, consensus,
   consensus gentium, consensus of opinion, consensus omnium, consent,
   consentaneity, consequence, consistency, consonance, consort,
   continuance, continuation, convey, cooperation, copy,
   corps de ballet, correspondence, counterfeit, couplet, crib, croon,
   deliver, descant, development, disclose, distich, ditto, division,
   do, do like, do-re-mi, double take, dramatis personae, dying words,
   echo, emit, ensemble, enunciate, envoi, epilogue, epode,
   equivalence, exposition, express, fake, figure, fling off,
   folderol, follow-through, follow-up, forge, formulate,
   general acclamation, general agreement, general consent,
   general voice, give, give expression, give out with, give tongue,
   give utterance, give voice, glee, glee club, go like,
   harmonic close, harmony, heptastich, hexastich, hoke, hoke up, hum,
   hymn, imitate, impart, interlude, intermezzo, intersection,
   intonate, intone, introductory phrase, last words, let out,
   like-mindedness, lilt, line, lip, madrigal, madrigaletto,
   make like, measure, meeting of minds, minstrel, mirror,
   mixed chorus, monostich, movement, musical phrase,
   musical sentence, mutual understanding, octastich, octave, octet,
   one accord, one voice, oneness, oratorio, oratorio society,
   ornament, ottava rima, out with, overlap, parallelism, part,
   parting shot, passage, peace, pentastich, period, peroration,
   phonate, phrase, pipe, plagiarize, postface, postfix, postlude,
   postscript, pour forth, present, pronounce, psalm, put forth,
   put in words, quatrain, quaver, raise, rapport, reecho, reflect,
   refrain, repeat, repertory company, repetend, resolution, response,
   rhyme royal, ritornello, roulade, same mind, say, second thought,
   section, self-consistency, septet, sequel, sequela, sequelae,
   sequelant, sequent, sequitur, serenade, sestet, set forth, sextet,
   shake, simulate, sing, sing in chorus, singing club, single voice,
   sol-fa, solmizate, sound, stanza, statement, stave, stock company,
   strain, strophe, subscript, suffix, supplement, supporting cast,
   swan song, syllable, symmetry, sync, synchronism, tag, tailpiece,
   tally, tell, tercet, terza rima, tetrastich, throw off, timing,
   total agreement, tremolo, trill, triplet, tristich, troll, troupe,
   tune, tutti, tutti passage, tweedle, tweedledee, twit, twitter,
   unanimity, unanimousness, undersong, understanding, uniformity,
   union, unison, unisonance, universal agreement, utter, variation,
   verbalize, verse, vocalize, voice, voices, warble, whisper,
   whistle, word, yodel



The Free On-line Dictionary of Computing (30 December 2018):

Chorus

    A distributed operating system developed
   at INRIA.

   (2006-09-20)