Definition

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

Example

In mathematics, an undecillion is often used to describe quantities that are extremely large.

Conversation

Have you ever heard of the number undecillion?

No, I haven't! What does it even mean?

It's actually a huge number, like a one followed by thirty-six zeros!

Wow, that's mind-boggling! I can't even imagine that much!

Synonyms & Antonyms

Root Explanation

Undecillion is formed from "un-" (meaning not) and "decillion" (from Latin "decem", meaning ten, combined with the suffix "-illion" which denotes a large number). The word refers to a number that is not a multiple of ten in the scale of large numbers, specifically 10 to the power of 36 in the American system.

Memory Tip

Think of 'un-' meaning not, and 'decillion' relating to ten — undecillion is a number that is not a simple ten, but a much larger one.

Visually Confused Words