From Middle English solempne, solemne, from Old French solempne, solemne, or from its etymon Late Latin sōlempnis, sōlennis, from Latin sōlemnis, from sollemnis. The further etymology is uncertain; sollus (ultimately from Proto-Indo-European *solh₂-) + epulum (in the sense of a ritual; perhaps ultimately from Proto-Indo-European *h₁ed-) has been suggested.
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