1. a person in charge of a jail or prison; a jailer
Usage: British spelling; American English typically uses 'jailer'; formal or official context

Examples

• The gaoler unlocked the cell door to allow the prisoner a brief visit.
• In medieval times, the gaoler was responsible for maintaining order in the dungeon.
• The strict gaoler enforced all prison regulations without exception.
• She worked as a gaoler at the local detention facility for over twenty years.
• The gaoler checked on the inmates every hour throughout the night.