That process of adjustment or accommodation which occurs between the members of two different races, if their contact is prolonged and if the necessary psychic conditions are present.
Simons, S.E., 'Social assimilation', American Journal of Sociology, 6, 1900:791
Park and Burgess, 1968
A process of interpenetration and fusion in which persons or groups acquire the memories, sentiments, and attitudes of other persons or groups, and, by sharing their experience and history, are incorporated with them in a common cultural life.
International Encyclopedia of the Social Sciences (IESS). Vol. 1, McMillan Company and The Free Press, 1968:438
From the point of view of non-dominant groups, when individuals do not wish to maintain their cultural identity and seek daily interaction with other cultures, the Assimilation strategy is defined.
Berry, J. W. , 'Immigration, Acculturation, and Adaptation'. Applied Psychology:An International Review, 46: 5–34. 1997:9