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What is collinearity in junior high school mathematics?
In junior high school mathematics terminology, "* * * line" means on the same straight line.

The concept of * * * line is generally used for multiple points, such as "three-point * * * line", which means that three points are on the same straight line.

Similarly, there is a concept of "* * * plane", which means that it is used for multiple lines on the same plane, or points and lines are on the same plane.