Definition of ceremonious adjective from the Oxford Advanced Learner's Dictionary

 

ceremonious

 adjective
adjective
BrE BrE//ˌserəˈməʊniəs//
 
; NAmE NAmE//ˌserəˈmoʊniəs//
 
(formal)
 
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behaving or performed in an extremely formal way She unveiled the picture with a ceremonious gesture. opposite unceremonious Word Origin mid 16th cent.: from French cérémonieux or late Latin caerimoniosus, from Latin caerimonia ‘religious worship’, (plural) ‘ritual observances’.
See the Oxford Advanced American Dictionary entry: ceremonious