annexation

noun

1. the act or an instance of annexing, or adding to something larger, especially the incorporation of new territory into the domain of a city, country, or state.
2. the fact of being annexed: Annexation of the two parts of the Bronx in 1874 and 1895 gave New York City the last of its five boroughs.
3. something annexed: Victory in battle resulted in territorial annexations that remained difficult to govern.

noun

1. the act of annexing, esp territory, or the condition of being annexed
2. something annexed