adjective
- lying on or passing through the same straight line
Usage: mathematics, geometry
Examples
- In geometry, three collinear points all lie on the same straight line.
- The three vertices are collinear, so they cannot form a triangle.
- Collinear vectors point in the same or opposite directions.
- If points A, B, and C are collinear, then B lies on the line segment AC.
- The mathematician proved that the four points were collinear by showing they satisfied the same linear equation.