Definition of "femtosecond" [femtosecond]

• A unit of time equal to 0.000 000 000 000 001 seconds and with symbol fs. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "One femtosecond is 10-15 seconds, that is, 0.000000000000001 seconds, which is to a second as a second is to 32 million years."
• "The laser, called a femtosecond laser, produces pulses lasting only a few quadrillionths of a second—a femtosecond is to a second what a second is to about 32 million years."
• "The key to creating this super-filament is an ultrabrief, ultraintense beam of light called a femtosecond laser pulse."