Femto

Femto is a prefix (see all prefixes) to a unit and means that it is 10-15 times this unit, or, one quindecillionth (European) or one quadrillionth (American). Examples are one femtosecond or one femtometre.

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Adopted in 1964, it comes from the Danish or Norwegian femten, meaning fifteen.

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Prefix: Prefix has meanings in linguistics, mathematics and computer science, and telecommunications....

Femtosecond: A femtosecond is the SI unit of time equal to 10-15 of a second. That is one quadrillionth, or one millionth of one billionth of a second. For context, a femtosecond is to a second, what a second is to about 31.7 million years....

Femtometre: REDIRECT1 femtometre...