• Webster's Revised Unabridged Dictionary
    • Exterritoriality The state of being beyond the limits of a country.
    • Exterritoriality The state of being free from the jurisdiction of a country when within its territorial limits.
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Century Dictionary and Cyclopedia
    • n exterritoriality 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.
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In literature:

In their case the exterritoriality attaches to the vessel.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 1" by Various
Exterritoriality of foreign man-of-war, =4=, 122-25.
"The Life of John Marshall Volume 4 of 4" by Albert J. Beveridge
Thus, thirdly, foreign monarchs and envoys, foreign men-of-war, and foreign armed forces must be granted exterritoriality.
"International Law. A Treatise. Volume I (of 2)" by Lassa Francis Oppenheim