1) French word used in English 2) Minute minute part 3) Not much time 4) One billionth of a second 5) Small time 6) Time unit 7) Unit of time 
A nanosecond (ns) is an SI unit of time equal to one billionth of a second (10{sup|−9} or 1/1,000,000,000 s). One nanosecond is to one second as one second is to 31.710 years. The word nanosecond is formed by the prefix nano and the unit second. Its symbol is ns. A nanosecond is equal to 1000 picoseconds or {frac|1|1000} microsecond. Because the...
One billionth (10-9) of a second.
(ns) (nan´o-sek″ond) one billionth (10−9) of a second.
[n] - one billionth of a second
nanosecond 1. A nanosecond (ns or nsec) is one billionth (10-9) of a second and is a common measurement of read or write access time to random access memory (RAM) on computer hard disks. 2. A popular term for an extremely short time.
noun one billionth (10^-9) of a second; one thousandth of a microsecond
one billionth of a second. Abbr.: ns, nsec