second (unit of time); arc second
in an instant; in a flash; right away; immediately
speed per second; velocity per second; instant; moment; a few seconds
winning in a flash; instant defeat
three-second rule (food hygiene myth); three seconds rule (basketball)
nanosecond; billionth of a second; ns
to have no time to lose; to fight with every minute and every second
rapid progress; minute-by-minute progress
femtosecond chemistry; femtochemistry
decays per second; disintegrations per second; dps
arc second; arcsecond; second of arc