the.com/colonialism

means The policy or practice of a country extending its power over other territories or peoples, typically by settling them and exploiting them economically and politically.

from From Latin 'colonia,' meaning 'farm' or 'settlement,' itself from 'colere,' 'to cultivate or till.' The word first just meant a planted outpost of citizens abroad — Rome did it, so did Greece. 'Colonialism' as the -ism, naming the whole system and ideology rather than just the act of settling, is a 19th/20th-century coinage, arriving precisely when the practice needed a name because people had started arguing about whether it should exist at all.