If two vectors are parallel they are said to be(adsbygoogle = window.adsbygoogle || []).push({}); collinear. In this case they can share the same direction or they can point to opposite directions.

1. For two parallel vectors sharing the same direction can I say that tey arecodirected? Is it a true English word? I did not find it in A.J.Lohwater's Russian-English dictionary published by AMS. If it is not a true word, which adjective is suitable for denoting such a pair of vectors?

2. For two parallel vectors pointing to opposite directions which form is better to say:

- they areopposite directedoropposite-directed;

- they arecontrary directed;

- they arecounter-directedorcounterdirected?

Please help me to choose a true wording.

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# A purely terminological question

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