Defined terms in a subject are terms that have specific meanings assigned to them within that subject, while undefined terms are terms that are not explicitly defined but are fundamental concepts in that subject. In mathematics, for example, undefined terms like point, line, and plane are used to build the foundation of geometric concepts, while defined terms like circle and triangle are derived from these fundamental concepts. Therefore, defined terms are constructed based on the fundamental understanding of undefined terms in a subject.
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A term that is undefined mean simply that it is not defined. The prefix un means not, and if you add it to the word defined, ta da, you get undefined.
The three undefined terms are the point,the line and the plane.
The answer depends on which undefined terms the question refers to.
This is true not just in geometry but in every field of knowledge. You can define complicated concepts in terms of simpler ones, and those simpler ones in still simpler ones and so on. However, you will end up with a few terms which cannot be defined in terms of simpler concepts (without going into a circular definition). These terms must remain undefined.
We often call "undefined terms" variables. Their value is not known; it can vary. And thus the name we assign them is variable.