Serious, grave, and formal in manner or tone; not joking or lighthearted. When something is solemn, it feels important and dignified.
From Old French 'solemne,' derived from Latin 'sollemnis' meaning 'customary' or 'formal.' Originally referred to official religious ceremonies and festivals, then expanded to describe any serious, formal occasion.
The word 'solemn' comes from the same root as 'solemnity'—it originally described special festival days in Roman religion, which is why it still carries that weight and importance when we use it today.
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