enclosure

(countable) Something enclosed, i.e. inserted into a letter or similar package.
(uncountable) The act of enclosing, i.e. the insertion or inclusion of an item in a letter or package.
(countable) An area, domain, or amount of something partially or entirely enclosed by barriers.
(uncountable) The act of separating and surrounding an area, domain, or amount of something with a barrier.
(uncountable) The post-feudal process of subdivision of common lands for individual ownership.
(religion) The area of a convent, monastery, etc where access is restricted to community members.