(1):
(n.) Something annexed or appended; as, an additional stipulation to a writing, a subsidiary building to a main building; a wing.
(2):
(v. t.) To attach or connect, as a consequence, condition, etc.; as, to annex a penalty to a prohibition, or punishment to guilt.
(3):
(v. t.) To join or attach; usually to subjoin; to affix; to append; - followed by to.
(4):
(v. t.) To join or add, as a smaller thing to a greater.
(5):
(v. i.) To join; to be united.