Definition

Describing lines or planes that meet at right angles, or relating to concepts in mathematics that involve right angles or perpendicularity.

Example

In geometry, two lines are orthogonal if they intersect at a right angle.

Conversation

Did you notice how those two lines are orthogonal to each other?

Yeah, it's interesting how they meet at right angles.

I always find it cool when geometry has these orthogonal relationships.

Definitely! It makes the shapes look more dynamic.

Synonyms & Antonyms

Root Explanation

Orthogonal → It is formed from "ortho-" (from Greek "orthos", meaning straight or correct) and "gonia" (from Greek "gonia", meaning angle). The word "orthogonal" refers to lines or planes that are at right angles to each other, hence the idea of being straight or correct at an angle.

Memory Tip

Think of 'straight' ('ortho-') lines meeting at a 'right angle' ('gonia') — that's why orthogonal describes things that are at right angles.

Visually Confused Words