A fellow presbyter or priest sharing the same ecclesiastical rank or church position.
From 'com-' (together) and 'presbyter' (elder priest), derived from Greek 'presbyteros' meaning elder. Medieval ecclesiastical Latin combined these to describe priests of equal rank.
Medieval church hierarchy was obsessed with ranking, so they had special words for priests at exactly the same level—compresbyter meant your equals in the clerical pecking order.
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