differentiation in WordNet English dictionary

1. the mathematical process of obtaining the derivative of a function
   differentiation 
   
2. a discrimination between things as different and distinct
   "it is necessary to make a distinction between love and infatuation"
   differentiation  distinction 
   
3. (biology) the structural adaptation of some body part for a particular function
   "cell differentiation in the developing embryo"
   specialization  specialisation  differentiation