Aristotle and the medieval logicians tried to integrate definition with division. For them to define means to divide and vice versa. Division is the splitting up of genus or higher class into its constituent species or subclasses according to a certain principle.
“The term to be divided must be a general term” is rule of logical division.
This rule is evident from the very definition of logical division. It is only a class, which can be divided into its sub-classes. Division aims at giving us a complete idea of the extension of the term and all the sub classes constitute the extension of the class.