The basic unit of time; used in everyday timing, sports, and scientific contexts.
It will finish in 10 seconds.
He ran 100 meters in 11 seconds.
arc second; second of arc
A unit of angular measurement equal to 1/3600 of a degree. Used in astronomy, geodesy, and navigation.
See also: 秒角
The resolution of this telescope is 0.5 arc seconds.
The surgery was a situation where every second counted.
He won by a margin of 0.1 seconds.
This system records time down to the second.
It takes 3 seconds for this app to start up.