All 4 Uses

annex
in
The Prince
(Auto-generated)

The new are either entirely new, as was Milan to Francesco Sforza, or they are, as it were, members annexed to the hereditary state of the prince who has acquired them, as was the kingdom of Naples to that of the King of Spain.†
Chpt 1 *

annexed = took territory
He who has annexed them, if he wishes to hold them, has only to bear in mind two considerations: the one, that the family of their former lord is extinguished; the other, that neither their laws nor their taxes are altered, so that in a very short time they will become entirely one body with the old principality.†
Chpt 3
The Romans, in the countries which they annexed, observed closely these measures; they sent colonies and maintained friendly relations with(*) the minor powers, without increasing their strength; they kept down the greater, and did not allow any strong foreign powers to gain authority.†
Chpt 3
CHAPTER V — CONCERNING THE WAY TO GOVERN CITIES OR PRINCIPALITIES WHICH LIVED UNDER THEIR OWN LAWS BEFORE THEY WERE ANNEXED†
Chpt 5

Definitions:

(1) (annex as in: annexed the community)
to take territory and make it part of a larger territory -- such as a city making land outside of it a part of the city
(2) (annex as in: annex of the main building)
an addition that extends a main building

or:

to attach something -- especially to something larger or more important
(3) (meaning too rare to warrant focus)