The Collaborative International Dictionary of English v.0.48:

Ceremony \Cer"e*mo*ny\, n.; pl. Ceremonies. [F.
   c['e]r['e]monie, L. caerimonia; perh. akin to E. create and
   from a root signifying to do or make.]
   1. Ar act or series of acts, often of a symbolical character,
      prescribed by law, custom, or authority, in the conduct of
      important matters, as in the performance of religious
      duties, the transaction of affairs of state, and the
      celebration of notable events; as, the ceremony of
      crowning a sovereign; the ceremonies observed in
      consecrating a church; marriage and baptismal ceremonies.
      [1913 Webster]

            According to all the rites of it, and according to
            all the ceremonies thereof shall ye keep it [the
            Passover].                            --Numb. ix. 3
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            Bring her up the high altar, that she may
            The sacred ceremonies there partake.  --Spenser.
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            [The heralds] with awful ceremony
            And trumpet's sound, throughout the host proclaim
            A solemn council.                     --Milton.
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   2. Behavior regulated by strict etiquette; a formal method of
      performing acts of civility; forms of civility prescribed
      by custom or authority.
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            Ceremony was but devised at first
            To set a gloss on . . . hollow welcomes . . .
            But where there is true friendship there needs none.
                                                  --Shak.
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            Al ceremonies are in themselves very silly things;
            but yet a man of the world should know them.
                                                  --Chesterfield.
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   3. A ceremonial symbols; an emblem, as a crown, scepter,
      garland, etc. [Obs.]
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            Disrobe the images,
            If you find them decked with ceremonies.
            . . . Let no images
            Be hung with C[ae]sar's trophies.     --Shak.
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   4. A sign or prodigy; a portent. [Obs.]
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            C[ae]sar, I never stood on ceremonies,
            Yet, now they fright me.              --Shak.
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   Master of ceremonies, an officer who determines the forms
      to be observed, or superintends their observance, on a
      public occasion.

   Not to stand on ceremony, not to be ceremonious; to be
      familiar, outspoken, or bold.
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WordNet (r) 3.0 (2006):

master of ceremonies
    n 1: a person who acts as host at formal occasions (makes an
         introductory speech and introduces other speakers) [syn:
         master of ceremonies, emcee, host]

Moby Thesaurus II by Grady Ward, 1.0:

65 Moby Thesaurus words for "master of ceremonies":
   AFTRA, Abbot of Unreason, DJ, Lord of Misrule, MC, anchor man,
   announcer, attorney, auteur, bailiff, ballyhoo man, barker,
   broadcaster, butler, callboy, commentator, costume designer,
   costumer, costumier, croupier, curator, custodian, director,
   disk jockey, emcee, equestrian director, exhibitor, factor,
   guardian, housekeeper, impresario, landreeve, librarian, majordomo,
   makeup man, marshal, news commentator, newscaster, playreader,
   proctor, procurator, producer, program director, programmer,
   prompter, radiobroadcaster, ringmaster, scenewright, seneschal,
   set designer, showman, social director, sound-effects man, spieler,
   sportscaster, stage director, stage manager, steward, theater man,
   theatrician, ticket collector, toastmaster, usher, usherer,
   usherette