Second


Second :

(1) (Metrol; Abb: sec; Symb: ") A fundamental unit of time, equal to 1/86,400 of a mean solar day, 1/360 of an hour, and 1/60 of a minute. Note: In the SI system, a second is equivalent to 9,192,631,770 cycles of the vibration between certain unperturbed, hyperfine levels of cesium-133. (2) (Geom) A unit of angle equal to 1/60 of a minute of arc or 1/3600 of a degree

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