The final church service of the day in Christian tradition, said before bedtime, which completes the cycle of daily prayers.
From Old French 'complie', derived from Latin 'completa' meaning 'completed' or 'finished.' The word entered English around the 14th century as part of the monastic office structure established by the Church.
Complin is the spiritual 'close-out' of the monastic day—monks would literally complete their prayer schedule before sleep, which is why the word became synonymous with completion itself. It's one of the few medieval Latin terms that survived in English because it filled a very specific religious need.
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