[of a person or a group of people] to include someone in all the activities of the group; to integrate someone into something. The club absorbed the new members into the organization.

[of matter or substance] to draw something into itself. The sponge absorbed all the moisture into its fibers.

Fig. [for someone] to become very interested or preoccupied with something or someone else's interests. Tom would often absorb himself in his children's activities on weekends.