From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ceremonial \Cer`e*mo"ni*al\, a. [L. caerimonialis: cf. F.
c['e]rimonial. See Ceremony.]
1. Relating to ceremony, or external rite; ritual; according
to the forms of established rites.
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Ceremonial observances and outward show. --Hallam.
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2. Observant of forms; ceremonious.
Note: [In this sense ceremonious is now preferred.] --Donne.
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He moves in the dull ceremonial track. --Druden.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Ceremonial \Cer`e*mo"ni*al\, n.
1. A system of rules and ceremonies, enjoined by law, or
established by custom, in religious worship, social
intercourse, or the courts of princes; outward form.
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The gorgeous ceremonial of the Burgundian court.
--Prescott.
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2. The order for rites and forms in the Roman Catholic
church, or the book containing the rules prescribed to be
observed on solemn occasions.
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From WordNet (r) 3.0 (2006) [wn]:
ceremonial
adj 1: marked by pomp or ceremony or formality; "a ceremonial
occasion"; "ceremonial garb"
n 1: a formal event performed on a special occasion; "a ceremony
commemorating Pearl Harbor" [syn: ceremony, ceremonial,
ceremonial occasion, observance]