- Differentiation Dif`fer*en`ti*a"tion, n.
1. The act of differentiating.
3. (Biol.) The gradual formation or production of organs or parts by a process of evolution or development, as when the seed develops the root and the stem, the initial stem develops the leaf, branches, and flower buds; or in animal life, when the germ evolves the digestive and other organs and members, or when the animals as they advance in organization acquire special organs for specific purposes. [1913 Webster]
The Collaborative International Dictionary of English. 2000.