Ceremonial

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late Middle English: from late Latin caerimonialis, from Latin caerimonia ‘religious worship’ (see ceremony).

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From Middle English cerymonial, from Latin caerimōniālis.

etymonline

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ceremonial (adj.)

c. 1400, "belonging to (religious) ritual," also as a noun, "a ceremonial practice," from Late Latin caerimonialis "pertaining to ceremony," from caerimonia (see ceremony). Related: Ceremonially.

Ceremonial means connected with or constituting or consisting of or fit for a ceremony (i.e. a piece of ritual or formality) or ceremonies .... Ceremonious means full of or resulting from ceremony i.e. attention to forms .... [Fowler]