Definitions:
(of lines, planes, or surfaces) side by side and having the same distance continuously between them

occurring or existing at the same time or in a similar way; corresponding

of or denoting electrical components or circuits connected to common points at each end, rather than one to another in sequence.

involving the simultaneous performance of operations

a person or thing that is similar or analogous to another

each of the imaginary parallel circles of constant latitude on the earth's surface.

two parallel lines (‖) as a reference mark.

be side by side with (something extending in a line), always keeping the same distance; run or lie parallel to

be similar or corresponding to