redifferentiation
/ˌriːdɪfərɛnʃɪˈeɪʃn/noun
1 Biology. The process of becoming specialized again following a loss of differentiation.
2 Mathematics. The differentiation of a derivative of a function.
Origin
Mid 19th century; earliest use found in Herbert Spencer (1820–1903), philosopher, social theorist, and sociologist. From re- + differentiation, after redifferentiate.