annexation

from The Century Dictionary.

• noun The act of annexing or uniting at the end; the act of adding, as a smaller thing to a greater; the act of connecting; conjunction; addition: as, the annexation of Texas to the United States.
• noun That which is annexed or added.
• noun In law: The attachment of chattels to a freehold, in such a manner as to give them the character of fixtures.
• noun In Scots law, the appropriating of church lands to the crown, or the union of lands lying at a distance from the kirk to which they belong to the kirk which is nearest to them.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of annexing; process of attaching, adding, or appending; the act of connecting; union.
• noun (Law) The union of property with a freehold so as to become a fixture. Bouvier. (b) (Scots Law) The appropriation of lands or rents to the crown.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An act of annexing, or territories that have been annexed.
• noun law A legal merging of a territory into another body.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the formal act of acquiring something (especially territory) by conquest or occupation
• noun incorporation by joining or uniting