A microsecond is a unit of time that measures one millionth (1/1,000,000) of a second. It is an extremely short period used to describe how fast something can happen. Full definition
According to Weinberg (1977 p. 5), a slightly different sequence of events in the first few microseconds of the «big bang» would have resulted in a universe of all helium and no hydrogen. (religion-online.org)
The top traders can execute their trades in microseconds with HFT. (ibankcoin.com)
Physicists at Brookhaven National Laboratory on Long Island in New York announced in April that they had re-created the searing - hot mix of exotic particles that filled the universe during the first few microseconds after the Big Bang. (discovermagazine.com)