1. differentiation, distinction

a discrimination between things as different and distinct

Example Sentences:
'it is necessary to make a distinction between love and infatuation'

• distinction

2. differentiation

the mathematical process of obtaining the derivative of a function

3. differentiation, specialisation, specialization

(biology) the structural adaptation of some body part for a particular function

Example Sentences:
'cell differentiation in the developing embryo'

• specialisation
• specialization