This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Of, appropriate to, or characterized by ceremony; formal or ritual.

adj. Involved or used in ceremonies: ceremonial garb.

n. A set of ceremonies prescribed for an occasion; a ritual.

n. A ceremony or rite.

adj. Of, relating to, or used in a ceremony; ritual or formal.

n. A ceremony, or series of ceremonies, prescribed by ritual.

adj. Relating to ceremony, or external rite; ritual; according to the forms of established rites.

adj. Observant of forms; ceremonious. [In this sense ceremonious is now preferred.]

n. 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.

n. The order for rites and forms in the Roman Catholic church, or the book containing the rules prescribed to be observed on solemn occasions.

Relating to ceremonies or external forms or rites: ritual; pertaining to or consisting in the observance of set forms or formalities.

Specifically Pertaining to the forms and rites of the Jewish religion: as, the ceremonial law, as distinguished from the moral law.

Observant of forms; precise in manners; formal: as, “the dull, ceremonial track,”

Synonyms Ceremonious, Formal, etc. See ceremonious.

n. A system of rites or ceremonies enjoined by law or established by custom, as in religious worship, social intercourse, etc.; rites, formalities, or requirements of etiquette, to be observed on any special occasion.

n. Specifically The order for rites and forms in the Roman Catholic Church, or the book containing the rules prescribed to be observed on solemn occasions.

n. A prehistoric stone implement-supposed to have been used for ceremonial purposes.

adj. marked by pomp or ceremony or formality

n. a formal event performed on a special occasion

"These and other scenes of Investitures, State Openings of Parliament, proceedings of Justices, Troopings of the Colour and the like come readily to mind when the word ceremonial is mentioned, and quite rightly."

formal   

ceremonial stone   

ritual    formal    form   

colonial    matrimonial    testimonial   

formal    sacred    traditional    royal    ceremonious    ecclesiastical    elaborate    stately    conventional    customary