the.com/parallel
two lines with the same direction and zero interest in ever meeting.
means lines or planes that stay the same distance apart forever, never touching, no matter how far you extend them.
from from greek parallelos, para (beside) plus allelon (one another) — literally beside each other, coined by geometers before euclid formalized the whole postulate.
euclid's fifthhis parallel postulate took 2000 years to question
non-euclidean twiston a sphere, parallel lines eventually cross
railroad prooftracks stay parallel so trains do not derail