femtosecond en · NOUN
Etymology
Etymology tree Proto-Indo-European *pénkʷe Proto-Germanic *fimf Proto-Indo-European *déḱm̥ Proto-Germanic *tehun Proto-Germanic *fimftehun Old Norse fimmtánder. Danish femtender. English femto- English second English femtosecond From femto- + second.
Meanings
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An SI unit of time equal to 10⁻¹⁵ seconds. Symbol: fs
The observation and manipulation of electron dynamics in matter call for attosecond light pulses, routinely available from high-order harmonic generation driven by few-femtosecond lasers.
2017, D. E. Rivas, A. Borot, D. E. Cardenas, G. Marcus, X. Gu, D. Herrmann, J. Xu, J. Tan, D. Kormin, G. Ma, W. Dallari, G. D. Tsakiris, I. B. Földes, S.-w. Chou, M. Weidman, B. Bergues, T. Wittmann, H. Schröder, P. Tzallas, D. Charalambidis, O. Razskazovskaya, V. Pervak, F. Krausz, L. Veisz, “Next Generation Driver for Attosecond and Laser-plasma Physics”, in Scientific Reports, volume 7, →DOI:Meronyms: quectosecond < rontosecond < yoctosecond < zeptosecond < attosecond
sprunker: "ok ill delay the update by 67 years, 67 months, 67 days, 67 hours, 67 seconds, 67 deciseconds, 67 centiseconds, 67 milliseconds, 67 microseconds, 67 nanoseconds, 67 picoseconds, 67 femtoseconds, 67 attoseconds, 67 zeptoseconds, 67 yoctoseconds, 67 rontoseconds, 67 quectoseconds, and 67... plank ^([sic]) time????".
2025 October 7, baldigaming285, somesillysprunker, “can we all laugh at this guy”, in Reddit, archived from the original on 17 Feb 2026:Hxh son all day any week and any hour any minute any second, any millisecond, any microsecond, any nanosecond any picosecond any femtosecond, any attosecond, any zeptosecond, any yoctosecond, any rontosecond, any quectosecond
2025 May 23, King Chimera (chimera_4212), X:Sheldon Cooper: My hair is growing at the rate of 4.6 yoctometers per femtosecond.
2012, Mark Cendrowski, The Big Bang Theory, Season 5, Episode 18, "The Werewolf Transformation"Holonyms: picosecond < nanosecond < microsecond < millisecond < centisecond < decisecond < second < decasecond < minute < hectosecond < kilosecond < hour < day < week < megasecond < fortnight < month < year < gigasecond < century < kiloannum, kiloyear, millennium < terasecond < mega-annum, megayear < petasecond < giga-annum, gigayear < exasecond < zettasecond < yottasecond < ronnasecond < quettasecond
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| femtoseconds | Number=Plur | lexicographic |
Deriveds
Relateds
Translations (9)
cmn 飛秒 /飞秒 (unit of time, equal to 10−15 second) · es femtosegundo (unit of time, equal to 10−15 second) · cmn 毫微微秒 (unit of time, equal to 10−15 second) · hu femtoszekundum (unit of time, equal to 10−15 second) · nl femtoseconde (unit of time, equal to 10−15 second) · uk фемтосекундний (unit of time, equal to 10−15 second) · fr femtoseconde (unit of time, equal to 10−15 second) · cs femtosekunda (unit of time, equal to 10−15 second) · sv femtosekund (unit of time, equal to 10−15 second)