All 3 Uses

differentiate
in
1984, by Orwell
(Edited)

Not merely the love of one person but the animal instinct, the simple undifferentiated desire: that was the force that would tear the Party to pieces.
p. 126.1 *

undifferentiated = without recognizing differences

standard prefix: The prefix "un-" in undifferentiated means not and reverses the meaning of differentiated. This is the same pattern you see in words like unhappy, unknown, and unlucky.
He began speaking with the peculiar grave courtesy that differentiated him from the majority of Inner Party members.
p. 157.4 *

differentiated = made different
A violent emotion, not fear exactly but a sort of undifferentiated excitement, flared up in him, then faded again.
p. 288.1

undifferentiated = without recognizing differences

standard prefix: The prefix "un-" in undifferentiated means not and reverses the meaning of differentiated. This is the same pattern you see in words like unhappy, unknown, and unlucky.

Definitions:

(1) (differentiate as in: differentiate between right/wrong)
to recognize difference
(2) (differentiate as in: differentiate our product)
to make different; or to show difference
(3) (meaning too rare to warrant focus)
See a comprehensive dictionary or Wikipedia for specialized senses of differentiation including definitions in the fields of mathematics, biology, geology, and the social sciences.