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Old French word solemnite comes from Latin sollus (Whole, entire, unbroken.)
sollus (Latin)
Whole, entire, unbroken.
sollemnis (Latin)
Common, usual, customary, ordinary, ritual, traditional. Established, appointed, fixed. Religious, solemn, ceremonial; festive. Yearly, annually.
sollemnitas (Latin)
Formality. Solemnity.
solemnite (Old French)