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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.
A set can be defined or undefined.
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.
Undefined is defined. Define means to set the limits, explain. So, undefine means not to set limits or not to explain.
What do you mean? Zero is a very well-defined number.