What is "collinearity"

n. 1 (context uncountable English) The condition of being collinear 2 (context countable English) The extent to which something is collinear

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".