Definitions:

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

Synonyms:

• affix
• extension
• fasten
• stick on

NearBy Words:

• annexa
• annexal
• annexation
• annexational
• annexe