1. To make something, or someone, not like others of the same kind: The color of their eyes is one thing that differentiates Mary's twins from each other.

There is little to differentiate one dictionary from another one because they all tend to have the same or very similar definitions and too often lack clarity because they use another form of the word that is being presented.

2. To identify that which sets one thing apart from something else; to tell one thing apart from another based on characteristics: For some people, including Janet and Linda, it is not easy to differentiate between ice cream and frozen yogurt.

1. Descriptive of something that distinguishes or separates one thing from another one: The differentiated markings on the wings of the brown butterfly identify it as a local insect, not a migratory one.
2. The similarity between a normal cell and the cancerous cell defines what degree of change has occurred: Cancerous cells that are well differentiated are close to the original cells and are usually less aggressive.

Poorly differentiated cells which have changed more and are more aggressive.