Definition

A very small unit of time equal to one sextillionth of a second.

Example

Scientists measured the reaction time in zeptoseconds to understand particle interactions better.

Conversation

Did you know that a zeptosecond is one sextillionth of a second?

Wow, that's incredibly fast! What do they even measure with that?

I read that scientists use it to study particle interactions.

That makes sense; it's amazing how precise our measurements can be.

Synonyms & Antonyms

Root Explanation

Zeptosecond → It is formed from 'zepto-' (from the SI prefix meaning one sextillionth, or 10^-21) and 'second' (from Latin 'secunda', meaning a division of time). The word 'zeptosecond' refers to a time interval that is one sextillionth of a second.

Memory Tip

Think of 'zepto-' as representing an incredibly tiny fraction, and 'second' as a unit of time — together, they help you remember that a zeptosecond is an extremely small measure of time.

Visually Confused Words