What does assimilation mean?
Assimilation refers to the process by which something — whether a person, a group, an idea, a nutrient, or even a speech sound — is absorbed into a larger body until it becomes part of that whole. In sociology, it most often describes how immigrants gradually adopt the language, customs, and values of a host society, sometimes willingly and sometimes under pressure, a usage that can carry charged connotations because it implies the loss of a distinct heritage. In physiology, assimilation denotes the conversion of absorbed nutrients into living tissue. In cognitive psychology, particularly in Jean Piaget's work, it names the way new information is fitted into existing mental frameworks. Linguists use the term for a sound change in which one phoneme grows more like its neighbour, as when the prefix 'in-' becomes 'im-' before 'possible'. Derived from Latin roots meaning 'to make similar', the word remains central to debates about immigration, identity, education, and cultural change across the English-speaking world.
nounThe process of absorbing and integrating people, ideas, or substances into a larger whole, so that they become indistinguishable from or fully incorporated into it; also, in phonetics, the process by which a speech sound becomes more like a neighbouring sound.
- The social process by which individuals or groups of differing ethnic, cultural, or national background are absorbed into the dominant culture of a society.
- The process of absorbing and incorporating food, nutrients, or other substances into the tissues of a living organism.
- In cognitive psychology (Piagetian theory), the process of fitting new information into existing mental schemas.
- In phonetics and phonology, the process by which a speech sound changes to become more similar to an adjacent sound.
"The assimilation of immigrants into the workforce transformed the city's economy over a single generation."
"Policies encouraging the cultural assimilation of newcomers were common in the early twentieth century."
"The small intestine is responsible for the final stages of digestion and the assimilation of nutrients into the bloodstream."
Rarely pluralized except when referring to multiple instances of the linguistic process or several distinct acts of incorporation.
"The chapter surveys the various assimilations that occur in connected speech."
In linguistics, assimilation is why you say 'in-possible' as 'impossible' — your mouth literally reshapes one sound to match its neighbour without you noticing.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of assimilation
Assimilation derives from the Latin verb assimulare, formed from ad- ('to, toward') plus similis ('like, similar'), literally meaning 'to make similar'. The word entered English in the late sixteenth or early seventeenth century, first used in scholarly and scientific contexts before extending to social and cultural processes. It shares its Latin root with a broad family including assimilate, simulate, dissimilar, and similarity.
Related word forms
How assimilation is actually used
"Assimilation" in sociological contexts can carry a negative connotation when it implies pressure to abandon minority identities, which is why writers often prefer "integration" to suggest mutual adaptation rather than one-sided absorption. In biology and phonetics the term is purely technical and neutral.
Easily confused with assimilation
Accommodation means adjusting or adapting to something else, whereas assimilation means being absorbed so completely that distinct identity is lost.