In geometry, collinearity of a set of points is the property of their lying 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.
“Collinearity.” Wikipedia, Wikimedia Foundation, 8 Mar. 2020, en.wikipedia.org/wiki/Collinearity.