A Latin ecclesiastical document issued to a priest certifying his good standing and right to perform Mass or hear confessions while traveling away from his home parish.
From Latin 'celebret' meaning 'let him celebrate,' a subjunctive form of 'celebrare' used in formal ecclesiastical documents.
Celebrets are basically medieval priest passports—before modern travel, wandering clergy needed letters saying 'yes, this person is a legitimate priest and can celebrate Mass here.'
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