Definition

A very large number that is equal to one followed by thirty zeros.

Example

In the United States, a quintillion is equal to one billion billion.

Conversation

Have you ever heard of a number as large as a quintillion?

Yeah, it's crazy to think about how big that is!

I read that it's equal to a billion billions, which is mind-blowing.

Absolutely! Just imagining that many stars in the universe is wild.

Synonyms & Antonyms

Root Explanation

Quintillion → It is formed from "quintus" (meaning fifth) and the suffix "-illion" (derived from the Latin "mille" meaning thousand). The word refers to a number that is a thousand raised to the power of five, or one followed by 18 zeros.

Memory Tip

Think of 'quintus' meaning fifth, and remember that a quintillion is a thousand raised to the fifth power, which is a huge number.

Visually Confused Words