IPA: //koʊˈlɪniər//
KK: /kəʊˈlɪnɪər/
Describing points or elements that lie on the same straight line or are arranged in a straight sequence.
The three points are collinear, meaning they all lie on the same straight line.
Colinear → It is formed from "co-" (meaning together) and "linearis" (from Latin "linea", meaning line). The word "colinear" describes points that lie on the same line, hence together on a line.
Think of points that are 'together' ('co-') on a 'line' ('linea') — that's why colinear means they lie on the same line.