秒 - second (1/60 minute)

second (unit of time)

speed per second; velocity per second

countdown

stop watch

picosecond

to have no time to lose; to fight with every minute and every second

decays per second; disintegrations per second; dps

femtosecond

three-second rule (food hygiene myth)

millisecond

arc second; arcsecond; second of arc

in an instant; in a flash; right away; immediately