Boarding (horses) (also known as a livery yard, livery stable, or boarding stable), is a stable where horse owners pay a weekly or monthly fee to keep their horse
Boarding (ice hockey), a penalty called when an offending player violently pushes or checks an opposing player into the boards of the hockey rink
Boarding (transport), transferring people onto a vehicle
Naval boarding, the forcible insertion of personnel onto a naval vessel
Boarding may "describe emergency department patients whose evaluation is complete and for whom the decision has been made to either admit or transfer, but for whom there is no available bed."