- published: 28 Oct 2014
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A microsecond is an SI unit of time equal to one millionth (10−6 or 1/1,000,000) of a second. Its symbol is µs.
A microsecond is equal to 1000 nanoseconds or 1/1,000millisecond. Because the next SI unit is 1000 times larger, measurements of 10−5 and 10−4 seconds are typically expressed as tens or hundreds of microseconds.