Question

What is the difference between defined and undefined terms?

Answer 1

defined is something that is described or already known and undefined is something that's is unknown

Answer 2

An undefined term is a term that can't be defined so easily. There really isn't a definition to define such terms. Consider the word "the." We use the word "the" all of the time, but do we really know how to define the word "the?" "Am" is another word that can't be defined so easily.