Meaning & use
collinear
(Geometry) Lying on the same straight line.
See it in a sentence
The three points were collinear, so no triangle could be formed between them.
A student proved that the midpoints of the sides were collinear.
A note on using this word
Collinear applies specifically to points; lines themselves are described as parallel or coincident, not collinear.
Words with a similar meaning
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