second

- noun a base
__SI unit__of measurement of time,__equal__to one sixtieth of a minute - noun a unit of measurement of the circumference of a circle,
__equal__to one sixtieth of a degree

- The fundamental SI
__unit__of time. One second is currently defined as 9,192,631,770 oscillations of a__cesium__-133 atom at its natural resonance frequency. Its abbreviation is s, or sec. - A unit of angular measure
__equal__to 1/60__arcminute__, or 1/3600 degree. Its__symbol__is'. Also called__arcsecond__. - symbol s

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