annexation

nouns

incorporation by joining or uniting
annexation, appropriation
is derived from
annexational
the formal act of acquiring something (especially territory) by conquest or occupation
"the French annexation of Madagascar as a colony in 1896"; "a protectorate has frequently been a first step to annexation"
annexation
is derived from
annexational
is a type of (narrower)
the act of contracting or assuming or acquiring possession of something
"the acquisition of wealth"; "the acquisition of one company by another"
acquisition