v be a distinctive feature, attribute, or trait; sometimes in a very positive sense
v calculate a derivative; take the derivative
v become different during development
v evolve so as to lead to a new species or develop in a way most suited to the environment
v become distinct and acquire a different character
a made different (especially in the course of development) or shown to be different
the differentiated markings of butterflies the regionally differentiated results
s exhibiting biological specialization; adapted during development to a specific function or environment
a not easy; requiring great physical or mental effort to accomplish or comprehend or endure
a difficult task nesting places on the cliffs are difficult of access difficult times
a hard to control
a difficult child", "an unmanageable situation