Undefined means that it is not possible to determine the answer of the question. For example: 18/0 - you can not divide anything by zero (0). Therefore the answer of this question is Undefined of Undefinable.
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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 number divided by 0.
something is undefined when the answer simply doesn't exist. for example, what in the limit of sin(x) as x approaches infinity? Since the function sin(x) oscillates back and forth for eternity, there is no limit. You simply can't put a final point on something that never stop moving back and forth, so the answer is undefined.
Undefined is defined. Define means to set the limits, explain. So, undefine means not to set limits or not to explain.
Undefined terms are numbers that con't be determined, like 1/0. Not to be confused with irrational numbers, though.