Definition of "nanosecond"

“We were heavily involved in also trading: people on Wall Street were buying our stuff to save a few nanoseconds on the wire, the banks were doing crazy things like pulling the fibres under the Hudson taut to make them a little big shorter, to save a few nanoseconds between their datacentre and the stock exchange,” he said.

2023 March 26, Alex Hern, quoting Michael Kagan, “Cryptocurrencies add nothing useful to society, says chip-maker Nvidia”, in The Guardian‎