Very formal and polite in manner, or given to performing ceremonies with strict attention to detail and proper form.
From Latin 'caeremoniosus', combining 'caerimonia' (rite) with '-osus' (full of). This suffix creates adjectives meaning 'full of' or 'characterized by', like 'dangerous' or 'generous'.
Ceremonious people are basically the opposite of casual—they care deeply about doing things the right way, which is why Jane Austen uses this word to describe stiff, formal characters who are so focused on propriety they can barely loosen up.
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