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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 femtometer. The origin of this prefix is the Danish word femten, which means fifteen. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Femto-".