Basic si unit (symbol sec or s) of time, one-sixtieth of a minute. It is defined as the duration of 9,192,631,770 cycles of regulation (periods of the radiation corresponding to the transition between two hyperfine levels of the ground state) of the cesium-133 isotope. In mathematics, the second is a unit (symbol ˛) of angular measurement, equaling one-sixtieth of a minute, which in turn is one-sixtieth of a degree.
1. 1/60 of a minute; the basic unit of time adopted under the Systčme International d'Unités; SYN. sec.
2. A 60th part of a minute of arc; SYN. arcsecond.
3. Following the first in an ordering or series:
4. The official attendant of a contestant in a duel or boxing match.
5. An endorsement of a motion, in parliamentary procedure; SYN. endorsement, approval. + prikaži više