1) House 2) Type of gate 1) Lodge 
[waterworks] A gatehouse, gate house, outlet works or valve house for a dam is a structure housing sluice gates, valves, or pumps (in which case it is more accurately called a pumping station). Many gatehouses are strictly utilitarian, but especially in the nineteenth century, some were very elaborate. A set of outlet works is a device used...
• (n.) A house connected or associated with a gate.
strong multi-storeyed structure containing a fortified gate
the entrance building in a curtain wall; usually one of the most heavily fortified parts of a castle
Gate'house` noun A house connected or associated with a gate. 
[n] - a house built at a gateway
the entrance building in a curtain wall; usually one of the most heavily fortified parts of a castle
A building at the entrance to the monastic grounds.
noun a house built at a gateway; usually the gatekeeper`s residence