- 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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