Definition, Meaning & Synonyms

femto

prefix

/ˈfɛm.toʊ/

Definition

A metric prefix that denotes a factor of 10^-15.

Examples

The femtosecond laser technology allows scientists to observe chemical reactions in real-time.
A femtometer is a unit of length in the metric system equal to one quadrillionth of a meter.

Meaning

Femto is used in the International System of Units (SI) to indicate a very small unit, specifically one quadrillionth or 0.000000000000001 of something.