What is Altius Tollendi?

Legal Definition
Civil law. The name of a servitude which consists in the right, to him who is entitled to it, to build his house as high as he may think proper. In general, however, every one enjoys this privilege, unless he, is restrained by home contrary title.
-- Bouviers Law Dictionary
Legal Definition
In the civil law. A servitude which consists in the right, to him who is entitled to it, to build his house as high as he may think proper. In general, however, every one enjoys this privilege, unless he ls restrained by some contrary title. Sandars, Just. Inst. 119.
-- Black's Law Dictionary
Legal Definition
An easement by which the height of one’s buildings was unlimited.
-- Ballentine's Law Dictionary