differentiate

Concise Oxford English Dictionary © 2008 Oxford University Press:
differentiate /ˌdɪfəˈrɛnʃɪeɪt/

▶verb

• 1 recognize or identify as different; distinguish.

  ■ cause to appear different or distinct.

• 2 technical make or become different in the process of growth or development.

• 3 Mathematics transform (a function) into its derivative.

– derivatives
differentiation noun,
differentiator noun.