convenience

(noun) the state of being suitable or opportune. Example: "Chairs arranged for his own convenience."

(noun) the quality of being useful and convenient. Example: "They offered the convenience of an installment plan."

(noun) a toilet that is available to the public. Synonyms: public toilet, comfort station, public convenience, public lavatory, restroom, toilet facility, wash room.

(noun) a device or control that is very useful for a particular job. Synonyms: appliance, contraption, contrivance, gadget, gizmo, gismo, widget.