Assimilation (from Latin assimilatio; "to render similar") may refer to more than one article:

• Assimilation (linguistics), a linguistic process by which a sound becomes similar to an adjacent sound
• Cultural assimilation, the process whereby a minority group gradually adapts to the customs and attitudes of the prevailing culture
  • Language shift or language assimilation, the progressive process whereby a speech community of a language shifts to speaking another language
  • Americanization (of Native Americans), cultural assimilation of Native Americans in the United States
  • Jewish assimilation
• Assimilation (biology) the conversion of nutrient into the fluid or solid substance of the body, by the processes of digestion and absorption
• Assimilation (meteorology), the process of objectively adapting the model state (of a numerical weather prediction model) to observations in a statistical optimal way taking into account model and observation errors.
• Assimilation (philosophy), incorporation of new concepts into existing schemes
• Assimilation (sociology), the blending or fusing of minority groups into the dominant society