noun
The basic unit of time; used in everyday timing, sports, and scientific contexts.
あと10秒で終わります。
It will finish in 10 seconds.
彼は100メートルを11秒で走った。
He ran 100 meters in 11 seconds.
noun
A unit of angular measurement equal to 1/3600 of a degree. Used in astronomy, geodesy, and navigation.
See also: 秒角
この望遠鏡の分解能は0.5秒です。
The resolution of this telescope is 0.5 arc seconds.