Questions about example sentences with, and the definition and usage of "Undefined"

A: Not defined. Something might be undefined because nobody has talked about it or given a name ("My relationship with her is undefined. I don't know if we're really dating or not.") Or something might be undefined because it is impossible to describe with a singke answer ("The product of any number divided by zero is undefined.")

A: 'Undefined' does NOT have a value or its just not defined. 'Indeterminate' has a value which cannot be precisely known. value of a real number divided by zero is undefined, in geometry definition of line, point,plane are not defined. These are undefined entities. The number of molecules on your fingertip is indeterminate. Surely,it has a finite value but you can't precisely know it.