An-nex-ā'tion, n.

noun

n. [See ANNEX, v.]

  1. The act of annexing, or uniting; conjunction; addition; the act of connecting; union; as, the annexation of Texas to the United States, of chattels to the freehold.
  2. (a.) (Law.) The union of property with a freehold so as to become a fixture. Bouvier. (b.) (Scots Law.) The uniting of lands or rents to the crown.

Bell. Wharton.