nanosecond
noun [ C ]
uk/ˈnænəʊˌsekənd/ us MEASURES, IT
a measurement equal to one billionth of a second, used to describe the speed at which a computer works on data:
The chip's memory access time of 26 nanoseconds made it highly competitive.
in a nanosecond
in an extremely short time:
Following the scandal, their stocks went from 100 to zero in a nanosecond.