cas•tel•lan(kas′tl n, ka stel′ən),USA pronunciationn.
Governmentthe governor of a castle.
Latin, as above
Old North French
Medieval Latin castellānus (noun, nominal) governor, occupant of a castle, (adjective, adjectival) of a castle (Latin: of a fortress), equivalent. to castell(um) castellum,castle + -ānus -an; replacing Middle English castelain