/ ˌserəˈməʊniəs; NAmE -ˈmoʊ-/ adjective
( formal ) behaving or performed in an extremely formal way
OPP unceremonious
► cere·mo·ni·ous·ly adverb
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WORD ORIGIN
mid 16th cent.: from French cérémonieux or late Latin caerimoniosus , from Latin caerimonia religious worship, (plural) ritual observances.