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1. An addition that extends a main building
   - annexe [Brit], extension, wing

1. Take (territory) as if by conquest
   "Hitler annexed Lithuania"
    
2. Attach to

Derived forms: annexed, annexing

Type of: add on, addition, add-on, affix, append, arrogate, assume, improver, seize, supplement, take over, usurp

Part of: building, edifice

Encyclopedia: Annex