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Assimilation

n.
  1. The act or process of assimilating or bringing to a resemblance, likeness, or identity; also, the state of being so assimilated; as, the assimilation of one sound to another.
  2. (Physiol.) The conversion of nutriment into the fluid or solid substance of the body, by the processes of digestion and absorption, whether in plants or animals.

The term assimilation has been limited by some to the final process by which the nutritive matter of the blood is converted into the substance of the tissues and organs.