Colonialism is defined as control by one power over a dependent area or people or a policy advocating or based on such control. (Merriam-Webster) This term would raise the eyebrows with indigenous peoples if mentioned in a discussion.Colonialism is defined as control by one power over a dependent area or people or a policy advocating or based on such control. (Merriam-Webster) This term would raise the eyebrows with indigenous peoples if mentioned in a discussion.