Acolyte is primarily used in religious settings to describe someone assisting with ceremonies. The bishop's acolyte carried the cross ahead of him.
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Not Clergy
An acolyte isn't a member of the clergy but has specific duties during worship. She was proud to be an acolyte, though not yet ready to commit to becoming a nun.
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Age-Related
Traditionally, acolytes are often younger members of a religious community. The church's youngest acolyte was only twelve, learning to serve at the altar.