What is the meaning of the word "annexe"?

Definitions:

  1. an addition that extends a main building copy to clipboard noun
    • We have to get to the annex. copy to clipboard
  2. to attach to copy to clipboard verb
    • I annexed the bibliography to my report. copy to clipboard
  3. to take territory as if by conquest copy to clipboard verb
    • The despot annexed the peninsula. copy to clipboard

Synonyms: