It means that they are skew.
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Yes. If two planes are not coincident (the same plane) and are not parallel, then they intersect in one straight line.
Lines that have one point in common are said to intersect one another at that point. Almost all straight lines of infinite length intersect one another, unless they are parallel to each other.
Two lines with one point in common are said to intersect at that point. Any two straight lines with infinite length will eventually intersect each other, unless they are parallel to each other.
Tangent circles.
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