
in English property law, the right of a building or house owner to the light received from and through his windows. Windows used for light by an ...
Found on
http://www.britannica.com/eb/a-z/a/69

Windows which have been opened for twenty years or more, and enjoyed without molestation by the owner of the house.
Found on
http://www.lectlaw.com/def/a192.htm

Ancient lights is a legal term for light enjoyed for 20 years or more through a defined aperture (such as a window) in a building. Under the Prescription Act (1832) the owner of the building has a right to such light, which may not thereafter be obstructed. Before the passing of this Act it was very difficult to obtain rights to any light, as the c...
Found on
http://www.probertencyclopaedia.com/browse/AA1.HTM
No exact match found.