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

parallel lines never meet

the road runs parallel to the Ottawa River

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

a parallel universe

they shared a flat in London while establishing parallel careers

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

highly parallel multiprocessor systems

a person or thing that is similar or analogous to another

a challenge which has no parallel in peacetime this century

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

a big concrete gutter that paralleled the road

be similar or corresponding to

the increase in the quality of wines has paralleled the rise of interest in food