Oxford English Dictionary Plantation 2b. The settling of people, usually in a conquered or dominated country; esp. the planting or establishing of a colony; colonization. [For instance, the English colonies installed in Ireland by King Henry VIII and Queen Elizabeth I were called "plantations," and the Pilgrims' first colony in New England was called "Plymouth Plantation."]
4a. A settlement in a conquered or dominated country; a colony. Also in extended use. Now hist. Chiefly with reference to the colonies founded in North America and on the forfeited lands in Ireland in the 16th-17th centuries; also with reference to the ancient colonies of Greece, etc.
5a. An estate or large farm, esp. in a former British colony, on which crops such as cotton, sugar, and tobacco are grown (formerly with the aid of slave labour).