parallel

Imagine railroad tracks stretching into the distance: they run side by side, stay the same distance apart, and never touch. In its simplest sense, this word describes things that go in the same direction without coming together. You might see it in geometry class with lines, or use it for two people whose lives are very similar in some ways but remain separate.

It is not just about lines, though. It can also show a clear similarity between ideas, events, or stories. Think of two arguments in a debate that support the same conclusion from different angles, or two stories with closely related themes. In cases like these, you can say they run parallel to each other.

The word "parallel" most commonly describes lines, planes, or edges that stay the same distance apart and never meet, no matter how far they extend. Picture railroad tracks, the opposite sides of a rectangle, or the long edges of a ruler. In geometry, parallel lines remain evenly spaced and have the same slope.

However, "parallel" extends far beyond physical shapes. It often describes situations, ideas, or developments that are similar while remaining separate. For example, you might say two countries are following parallel paths in economic development, meaning they are changing in similar ways but independently of one another. In work, study, or planning, it can also refer to things happening at the same time, such as a company running parallel systems during a transition or two teams working in parallel on related tasks.

The concept is also vital in technology. In computing, parallel processing involves using multiple processors to perform different parts of a task simultaneously, vastly speeding up complex calculations.

Figuratively, "parallel" can suggest a strong resemblance between two things. You might point out a historical parallel between two different eras, or note that two events are happening in parallel, meaning they are taking place at the same time but are not necessarily directly connected. Whether it is used in geometry, technology, or everyday life, the word suggests things moving side by side: alike in direction, pattern, or timing, yet still separate.