us·que ad coe·lum \ˈüskwāädˈkȯiləm, ˈəskwēadˈsēləm\ Etymology: New Latin : up to the heavens : as far as heaven — referring to a rule in law that the owner of land owns the air space above it indefinitely upward < the Swiss Government announced that it adopted the principle of territoriality usque ad coelum — Times Hist. of the War >