Hypernym for 'parallel' and 'antiparallel'

Question

What is a word that includes both parallel and antiparallel ?

This bothers me all the time when I do my math or physics homework.

Strictly speaking, parallel is the hypernym -- antiparallel is, a type of parallel. Incidentally, the "ortho-" parallel is the other type (hyponym). — Kris, Commented Oct 23, 2014 at 20:29
@Kris Ooooh, ok, I was wondering if that was the case. That answers my question. Why do people always answer questions in comments... — michaelsnowden, Commented Oct 24, 2014 at 15:37

Dave Magner · Accepted Answer · 2014-10-23 21:36:06Z

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Those are words used to describe the orientation of lines relative to other lines. I would use "relative orientation".

answered Oct 23, 2014 at 21:36

Dave Magner

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Alex W · Accepted Answer · 2014-10-23 18:42:52Z

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It seems that direction would be a good hypernym. Parallel is a way of describing a direction or orientation of an object:

Parallel 1. a : extending in the same direction, everywhere equidistant, and not meeting

Antiparallel is similar

Antiparallel: parallel but oppositely directed or oriented

answered Oct 23, 2014 at 18:42

Alex W

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That is not quite how you find a common parent. Direction is but one part of the story.
– Kris
Commented Oct 23, 2014 at 20:23

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Юрий Шабалин · Accepted Answer · 2018-11-12 11:23:27Z

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The word you need is collinear. Collinear vectors could have same or opposite directions. https://math.tutorvista.com/calculus/collinear-vectors.html

answered Nov 12, 2018 at 11:23

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Could you provide an example, please?
– Юрий Шабалин
Commented Nov 13, 2018 at 17:18
Never mind. You are correct, under standard representation and definiots, parallel" and "collinear" are synonymous terms for vectors.
– Mark Beadles
Commented Nov 13, 2018 at 17:54

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