The term assimilation originates from the Latin root assimiliare, meaning 'to make similar' or 'to bring into resemblance'. In sociology, it is classified by MacIver and Page as a major associative social process, distinct from cooperation and accommodation, representing a more permanent and unconscious blending of diverse social groups.
- Robert E. Park and Ernest W. Burgess (1921): In their seminal work Introduction to the Science of Sociology, they defined assimilation as "a process of interpenetration and fusion in which persons and groups acquire the memories, sentiments, and attitudes of other persons and groups, and, by sharing their experience and history, are incorporated with them in a common cultural life."
- Bogardus's Typology: Emory S. Bogardus viewed assimilation not as a sudden event but as a gradual, psychological, and sociological adjustment wherein distinct cultural groups lose their separate identity and become part of a unified whole.
- Classical Parallels: While Auguste Comte focused on consensus (consensus universalis) and Émile Durkheim analyzed mechanical and organic solidarity (The Division of Labour in Society, 1893) as mechanisms binding society together, Max Weber examined cultural and value integration through his sociology of religion and communal action.