1. a building at or over a gate, especially at the entrance to a castle, estate, or other large property

Examples

• The medieval castle’s gatehouse still stands after 800 years.
• Visitors must check in at the gatehouse before entering the estate.
• The university’s main gatehouse was built in the Gothic Revival style.
• Security guards stationed in the gatehouse monitored all incoming traffic.
• The old gatehouse has been converted into a small museum.
• Stone carvings decorated the entrance to the monastery’s gatehouse.