nanosecond, ns, 10^-9 s (Tw); PRC equivalent: 納秒|纳秒[na4 miao3]

microsecond, µs, 10^-6 s

to count the number of seconds (between two events)

millisecond, ms

picosecond, ps, 10^-12 s

nanosecond, ns, 10^-9 s (PRC); Taiwan equivalent: 奈秒[nai4 miao3]

to count down the remaining seconds (e.g. in games, rocket launches, New Year's Eve); (of a boxing referee) to administer the count following a knock-down, starting from "one"

leap second

(physics) attosecond (10⁻¹⁸ s)

femtosecond, fs, 10^-15 s

lit. fight minutes, snatch seconds (idiom); a race against time; making every second count

each and every moment