A cognitive power that depends on a bodily organ. 

External Senses.— Senses by which human beings and other animals perceive things in the physical world. These senses include the power of sight, hearing, touch, taste, and smell.  Such external senses are distinguished from the internal senses, in that the former involve awareness of the existential presence of what is sensed. 

Internal Senses.— Senses by which one processes the perceptions of the external senses. These include imagination, the common sense, the estimative sense (in non-human animals), the cogitative sense (in human beings), and the sense memory.