Absorption of a minority group within a larger population; distinct from integration in that it implies a loss of cultural identity and ultimately of individuality. Usually relates to the pressure on immigrants to conform to the expectations of the mass culture in their new country. More recently applied to the aggressive subjugation of races by the Borg, and hence to a person joining a large faceless group of stupid people.
"Bad news; she bought the Avril album. Her assimilation is complete."
(1)The act of being assimilated; usually by the Borg. Or, (2)the absorbtion of a foreign body into a living being.
(1) This is the Borg. You will be assimilated. We will add your biological and technological distinctions to our own. You will adapt to service us. Resistance is futile.
or (2) I assimilated that bullet you shot me in the leg with.
It is what the United State's government did to the indigenous tribes in order to cast out the inner "native" from them. Involved sending the children to the state-run boarding schools in order to destroy their "savage" culture. In many cases, assimilation was the solution for the government to obtain land, stripping the indigenous of precious resources.