Webster's English Dictionary

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assimilation

as.sim.i.la.tion \*-.sim-*-'la--sh*n\ n 1a: an act, process, or instance of 
   assimilating  1b: the state of being assimilated  2: the incorporation or 
   conversion of nutrients into protoplasm that in ani mals follows digestion 
   and absorption and in higher plants involves both photosynthesis and root 
   absorption 3: adaptation of a sound to an adjacent sound {in the word 
   cupboard  the /p/ sound of the word cup has undergone complete ~}