solemn (adj.)

mid-14c., "performed with due religious ceremony or reverence, sacred, devoted to religious observances," also, of a vow, etc., "made under religious sanction, binding," from Old French solempne (12c., Modern French solennel) and directly from Latin sollemnis "annual, established, religiously fixed, formal, ceremonial, traditional," perhaps related to sollus "whole" (from PIE root *sol- "whole, well-kept").

"The explanation that Latin sollemnis was formed from sollus whole + annus year is not considered valid" [Barnhart], but some assimilation via folk-etymology is possible. In Middle English also "famous, important; imposing, grand," hence Chaucer's friar, a ful solempne man. Meaning "marked by seriousness or earnestness" is from late 14c.; sense of "fitted to inspire devout reflection" is from c. 1400. Related: Solemnly.

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Definitions of solemn from WordNet

solemn (adj.)
dignified and somber in manner or character and committed to keeping promises;
a solemn promise
the judge was solemn as he pronounced sentence
Synonyms: grave / sedate / sober
solemn (adj.)
characterized by a firm and humorless belief in the validity of your opinions;
a film with a solemn social message
Synonyms: earnest / sincere