20250924-0 secondo second sekund segundo segundo Sekunde sekunda másodperc seconde sekunda sekundė секунда sekunda sekunti sekundes sekund soicind δευτερόλεπτο sekunda secundă sekunda seconde sekonda sekund 2019-01-10 2023-11-14 1952-07-23 SEC 2019-02-07 2019-01-23 sekundi s сек sekundy sekunde s s sekúnd s sekuntia secondes sekund секунди s s s sekundy sekunder seconds s s s sekundės sekundi segundos s sekunžu s s s sekundit sekondi seconden s Sekunden sekund s s sekundy sekunder δευτερόλεπτα sekunde secondi s segundos s s sekund secunde s s s sekundžių shoicind The second (s) is the base unit of time in the International System of Units (SI), commonly understood and historically defined as 1⁄86400 of a day. However, it is defined by the SI as the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom. SEC false SEC 1952-07-23 SEC