femtosecond
noun
a unit of time equal to one quadrillionth (10-15) of a second. Abbreviation: fs.
femtoseconds
-
pluralof femtosecond.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Ultrafast lasers generate incredibly short bursts of light that last only picoseconds or femtoseconds.
From Science Daily ● May 21, 2026
A femtosecond is one quadrillionth of a second -- one second holds about eight times more femtoseconds than all the hours that have passed since the universe began.
From Science Daily ● Mar. 6, 2026
"There are more femtoseconds in one second than there are days in the age of the universe," Jangid said.
From Science Daily ● Jan. 17, 2024
"Within femtoseconds, the laser pulse excites the electrons in the material. Several picoseconds later, the excited electrons transfer their energy to the atomic nuclei."
From Science Daily ● Dec. 7, 2023
"We measure very fast fluctuations and have developed a method with which fluctuations can still be detected on the ultrashort time scale of femtoseconds," says experimental physicist Sebastian Gönnenwein.
From Science Daily ● Nov. 29, 2023
