(Of an object) that opens, or is designed to open automatically, or opens of its own accord.

plural of door opener

The control mechanism by which a door is latched and unlatched. / Any of various devices to automatically open a door in response to a sensor or signal sent from a controller.

(chess) Synonym of Ruy Lopez

(law) A requisite condition of adverse possession stipulating that the disseisor's occupation of the property must be visible and provide reasonable (if tacit) notice to the disseisee.

(physics) index (on a tensor) that isn't summed over

The team in a British Parliamentary Style debate which gets the second and fourth speech (of a total of eight).

The team in a British Parliamentary Style debate which gets the first and third speech (of a total of eight).

(philosophy) A philosophical concept that refers to the universal possibility of imprecision in empirical statements.

porous / (philosophy) evading a precise or holistic definition / (law) subject to constant attempts at ascribing a meaning, due to a legal rule's vagueness or multiple interpretations