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Coplanar lines that don't intersect are parallel. Lines that are not parallel and do not intersect are skew lines.
Skew lines are a term for lines in geometry. They mean two lines that are not parallel, but do not intersect either. It is only possible in three dimensions and up.
A set can be defined or undefined.
parallel
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.