Before revision: In the history of archaeological theory the term migrationism was opposed to the term diffusionism (or "immobilism") as a means of distinguishing two approaches to explaining the spread of prehistoric archaeological cultures and innovations in artefact.
After revision: The term migrationism, in the history of archaeological theory , was opposed to the term diffusionism (or "immobilism") as a means of distinguishing two approaches to explaining the spread of prehistoric archaeological cultures and innovations in artefact.