A person who works with another person to share duties, responsibilities, or tasks, especially in official positions.
From Latin co- + adjutor (helper), from adjuvare (to help). This term became especially common in ecclesiastical contexts, where it described assistant bishops and clergy members who shared authority with their superiors.
The Catholic Church still uses 'coadjutor bishop' as an official position—it literally means a bishop who helps the main bishop and is training to take over. It's one of the oldest continuous job titles!
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