Collinearity
（重定向自Collinear）
![An antenna mast with four collinear directional arrays.](/Images/godic/202501/05/Antenna-tower-collinear-et-al4421.jpg")
In geometry, collinearity is the property possessed by a set of points that lie on a single line. A set of points with this property is said to be collinear (sometimes spelled as colinear). In greater generality, the term has been used for aligned objects, that is, things being "in a line" or "in a row".