Definition

Not having any measurable dimensions or units.

Example

In physics, a dimensionless quantity is often used to simplify calculations.

Conversation

Did you know that some physical constants are considered dimensionless?

Really? I didn't know that; what does it mean exactly?

It means they don't have any units associated with them.

That makes sense! It's interesting how some values can be so unique.

Synonyms & Antonyms

Root Explanation

Dimensionless → It is formed from "dimension" (from Latin "dimensio", meaning measurement) and "-less" (meaning without). The word "dimensionless" refers to something that does not have any measurable dimensions or size.

Memory Tip

Think of something that is 'without' ('-less') any 'measurement' ('dimensio') — that's why dimensionless means it has no size or extent.

Visually Confused Words