Also called freight ton . a unit of volume for freight that weighs one ton, varying with the type of freight measured, as 40 cubic feet of oak timber or 20 bushels of wheat. 3. metric ton. 4. displacement ton. 5. a unit of volume used in transportation by sea, commonly equal to 40 cubic feet (1.13 cu. m).
When in a biological process, less specialized cells evolves into more specialized ones, the process is called as cell differentiation. This process is mostly seen in multicellular organisms.
An adult human, for example, has about 10 or even 100 trillion cells. The cell divisions are mitosis. By development we mean that as the embryo grows cells become different, a process that is called, logically enough, differentiation.