"differentiation" in the noun sense
1. differentiation, distinction
a discrimination between things as different and distinct on the basis of their characteristics or attributes
"it is necessary to make a distinction between love and infatuation"
the mathematical process of obtaining the derivative of a function
3. specialization, specialisation, differentiation
biology) the structural adaptation of some body part for a particular function
"cell differentiation in the developing embryo"
Source: WordNet® (An amazing lexical database of English)
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