A set of points is collinear (often misspelled as, but should not be confused with, co-linear or colinear) if they lie on a single line. Related concepts include:
- Line (geometry), a primitive (undefined) object type in most geometries. Encompasses the idea of a straight line in Euclidean geometry
- Multicollinearity, a statistical phenomenon in which two or more predictor variables in a multiple regression model are highly correlated
- Colinear map (or co-linear map), the dual notion of a linear map in comodule theory
- Concurrent lines in geometry, the dual notion of collinear points
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