the GNU version of the Collaborative International Dictionary of English
n. The state of being beyond the limits of a country.
n. The state of being free from the jurisdiction of a country when within its territorial limits.
The Century Dictionary and Cyclopedia
n. A legal fiction by which the persons and residences of ambassadors and sovereigns when abroad are treated as being still within their own territory; the privilege extended by law and custom to all diplomatic representatives of foreign powers and their families resident within the territory of a nation, of enjoying in general the same rights and privileges as belong to them in their own country. Also extraterritoriality.
Word Usage
"I have explained elsewhere that Ambassadors, their families, their staffs, and even all the Embassy servants enjoy what is called exterritoriality; that is, that by a polite fiction the"