Definition of solemn

< solely

solemnity >

sol·emn    (slm) KEY 

ADJECTIVE:

1. Deeply earnest, serious, and sober.
2. Somberly or gravely impressive. See Synonyms at serious.
3. Performed with full ceremony: a solemn High Mass.
4. Invoking the force of religion; sacred: a solemn vow.
5. Gloomy; somber.

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ETYMOLOGY:
Middle English solemne, from Old French, from Latin sollemnis, established, customary; see sol- in Indo-European roots

OTHER FORMS:
solemn·ly(Adverb), solemn·ness(Noun)