Definition of ceremonious adjective from the Oxford Advanced American Dictionary

 

ceremonious

 adjective
adjective
NAmE//ˌsɛrəˈmoʊniəs//
 
(formal)
 
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behaving or performed in an extremely formal way She unveiled the picture with a ceremonious gesture. opposite unceremonious
ceremoniously
 
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adverb Dr. North ceremoniously raised his glass to offer a toast.
See the Oxford Advanced Learner's Dictionary entry: ceremonious