Absorption
Part of speech: noun
Definition: The act or process of absorbing or sucking in anything. The act or process of being absorbed and made to disappear. An imbibing or reception by molecular or chemical action. In living organisms, the process by which the materials of growth and nutrition are absorbed and conveyed to the tissues and organs. Entire engrossment or occupation of the mind.
Assimilation
Part of speech: noun
Definition: The act of assimilating or the state of being assimilated.The metabolic conversion of nutriments into tissue.The absorption of new ideas into an existing cognitive structure.A sound change process by which the phonetics of a speech segment becomes more like that of another segment in a word (or at a word boundary), so that a change of phoneme occurs.The adoption, by a minority group, of the customs and attitudes of the dominant culture.
Example sentence: But then I came to the conclusion that no, while there may be an immigration problem, it isn't really a serious problem. The really serious problem is assimilation.