We often call "undefined terms" variables. Their value is not known; it can vary. And thus the name we assign them is variable.
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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.
I am prepared to define any term in geometry. If there is some term for which you would like to have a definition, just ask.
there isn't a need
The three undefined terms are the point,the line and the plane.
The answer depends on which undefined terms the question refers to.