The part of the road system that is away from urban and suburban areas and on which large distances can be travelled without needing to frequently slow for traffic or intersections.

Or or relating to travelling on the open road.

(nautical, military) The maximum depth at which a submarine is permitted to operate when actively engaged in battle.

plural of operating depth

(Internet marketing) A measure used by marketers as an indication of how many people "view" or "open" the electronic mail they send out.

mysid shrimp

(telecommunications) A provider of mobile telecommunications who does not operate any physical network infrastructure, but relies on contracting with physical mobile telecom network infrastructure operators to provide mobility access.

(engineering) A mechanical task requiring relatively little skill.

plural of screwdriver operation

Alternative form of open door