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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.
We often call "undefined terms" variables. Their value is not known; it can vary. And thus the name we assign them is variable.
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.
A binomial is a mathematical term for a polynomial with two terms.
Nobody is lowest term. "Lowest term" is a mathematical expression, not a person!