parallel
The two lines are parallel to each other.
The lines never meet because they are always the same distance apart.
Lying or moving in the same direction but always the same distance apart.
The railroad tracks run parallel for miles.
The tracks never converge because they are parallel.
Used in geometry to describe lines or planes that never intersect.
Similar or comparable in some way.
Her career path is parallel to her sister's.
Both careers developed in similar ways.
Often used to compare experiences, processes, or characteristics.
A parallel line or plane.
Draw a parallel to the given line through point P.
Construct a line that never intersects the original and maintains the same distance.
Common in mathematical and technical contexts.
A comparison that shows similarity between two things.
The author draws a parallel between war and natural disasters.
The comparison highlights shared destructive effects.
Used in writing to emphasize likeness between unrelated concepts.
Occurring or existing at the same time.
Parallel events unfolded in different cities.
The events happened simultaneously.
Less common; often replaced by 'simultaneous' in formal contexts.
Collocations
Related Phrases
Pro Tip
Avoid confusion with 'comparable'
While 'parallel' implies similarity in direction or relationship, 'comparable' simply means 'able to be compared'. For example: 'Their skills are parallel' (similar development) vs. 'Their skills are comparable' (of similar level).
Gold Rule
Parallel vs. Perpendicular
Parallel lines never meet; perpendicular lines intersect at a 90-degree angle. Remember: parallel lines are like train tracks—always the same distance apart.
Word Origin
From Latin *parallelus*, from Greek *parállēlos* (παράλληλος), meaning 'alongside another', from *para-* (beside) + *allēlos* (one another).
Usage Notes
As an adjective, 'parallel' can describe physical lines, abstract concepts, or concurrent events. In computing, 'parallel processing' refers to executing multiple tasks simultaneously. Avoid using 'parallel' to mean 'equal'—use 'equivalent' or 'comparable' instead.