Meaning of “parallel” - Learner’s Dictionary

parallel

adjective uk us /ˈpærəlel/
SAME DISTANCE

If two or more lines are parallel, the distance between them is the same along all their length:

The streets are parallel.
SIMILAR

similar and happening at the same time:

Parallel experiments are being conducted in both countries.

(Definition of “parallel adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)