annex

from The American Heritage® Dictionary of the English Language, 5th Edition.

• transitive verb To append or attach, especially to a larger or more significant thing.
• transitive verb To incorporate (territory) into an existing political unit such as a country, state, county, or city.
• transitive verb To add or attach, as an attribute, condition, or consequence.
• noun A building added on to a larger one or an auxiliary building situated near a main one.
• noun An addition, such as an appendix, that is made to a record or other document.

from The Century Dictionary.

• noun Something annexed; specifically, a subsidiary building connected with an industrial exhibition; hence, any similar arrangement for the purpose of providing additional accommodation, or for carrying out some object subordinate to the main and original object. Also spelled annexe.
• To attach at the end; subjoin; affix: as, to annex a codicil to a will.
• To unite, as a smaller thing to a greater; join; make an integral part of: as, to annex a conquered province to a kingdom.
• To attach, especially as an attribute, a condition, or a consequence: as, to annex a penalty to a prohibition.
• Synonyms Add, Affix, Attach. See add and list under affix.

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

• intransitive verb To join; to be united.
• noun Something annexed or appended; as, an additional stipulation to a writing, a subsidiary building to a main building; a wing.
• transitive verb To join or attach; usually to subjoin; to affix; to append; -- followed by to.
• transitive verb To join or add, as a smaller thing to a greater.
• transitive verb To attach or connect, as a consequence, condition, etc..

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

• noun An addition, an extension.
• noun An appendix.
• noun An addition or extension to a building.
• noun An addition to the territory of a country or state, from a neighbouring country or state, normally by military force.
• verb To add something to another, to incorporate into.

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

• verb take (territory) as if by conquest
• verb attach to
• noun an addition that extends a main building