annex

Definitions:

To unite; to add on at the end; to unite a smaller thing to a greater; to connect.
- Nuttall's Standard dictionary of the English language. By Nuttall, P.Austin. Published 1914. (verb) (v.) (verb)
To unite; to join to the end; to affix.
- Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874. (verb) (v.) (verb)
To join at the end or boundary; to affix.
- The Clarendon dictionary. By William Hand Browne, Samuel Stehman Haldeman. Published 1894. (verb) (v. t.) (verb transitive)
Something attached to something else; an auxiliary building.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (noun) (n.) (noun)
To add to the end: to affix.
- The american dictionary of the english language. By Daniel Lyons. Published 1899. (verb) (v. t.) (verb transitive)
To join; to be united.
- Newage Dictionary DB (verb) (v. i.) (verb intransitive)
To add or attach at the end; to affix or connect; to unite.
- The Winston Simplified Dictionary. By William Dodge Lewis, Edgar Arthur Singer. Published 1919. (verb) (v. t.) (verb transitive)

Usage examples:

The Cables and the Harbins went at once to the Annex where David Cable had taken rooms.
- Jane Cable by George Barr McCutcheon
Annex steamers connect at wharf in New York for Brooklyn and Jersey City.
- by
It's a great place, Primrose Park is, and when I sized it up as a sort of annex to a cemetery I'd mistook the signs.
- Shorty McCabe by Sewell Ford