n (science) A measurement of one physical quantity that is used as an indicator of the value of another
n (software) An interface for a service, especially for one that is remote, resource-intensive, or otherwise difficult to use directly.
v (context|networking) To function as a server for a client device, but pass on the requests to another server for service.
n (context|gaming|slang) A proximity mine; a mine that explodes when something approaches within a certain distance.