1. To incorporate nutrients into the body after digestion.
    Food is assimilated and converted into organic tissue.
  2. To incorporate or absorb knowledge into the mind.
    The teacher paused in her lecture to allow the students to assimilate what she had said.
  3. To absorb a group of people into a community.
    The aliens in the science-fiction film wanted to assimilate human beings into their own race.
  4. To compare a thing to something similar.
  5. To bring to a likeness or to conformity; to cause a resemblance between.

The above text is a snippet from Wiktionary: assimilate
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