【Absorb】 , 【imbibe】 and 【assimilate】 all mean to take something in so as to become imbued with it.
【Absorb】 is like to suggest a loss of identity in what is taken in or an enrichment of what takes in. (see also: Monopolize vs Engross vs 【Absorb】 vs Consume and Interesting vs Engrossing vs Absorbing vs Intriguing and Intent vs Engrossed vs Absorbed vs Rapt and Absorbed by vs Absorbed with )
【Imbibe】 implies a drinking in and may imply an unconscious taking in whose effect may be significant or profound.
【Assimilate】 stresses an incorporation into the substance of the body or mind. (see also: Identify vs Incorporate vs Embody vs 【Assimilate】 )