mi·​cro·​sec·​ond ˈmī-krō-ˌse-kənd How to pronounce microsecond (audio)
: one millionth of a second

Examples of microsecond in a Sentence

Recent Examples on the Web The simulations need to account for atomic vibrations that occur on the scale of femtoseconds while simulating physical and chemical changes, such as changes in an atom’s position relative to its neighbors, that emerge on the scale of microseconds. The Physics Arxiv Blog, Discover Magazine, 24 May 2024 On the moon, a smaller body where the gravitational pull is much weaker, time moves more quickly and unevenly: Lunar time gains about 58.7 microseconds per day compared to Earth’s time, though even this can vary, depending on the altitude and longitude where lunar clocks may be located. Christian Thorsberg, Smithsonian Magazine, 4 Apr. 2024 Time moves quicker on the moon Time moves quicker (by 58.7 microseconds) every day on the moon relative to Earth because of the different gravitational field strength on the moon, the memo said. Sarah Al-Arshani, USA TODAY, 3 Apr. 2024 Time on the moon moves 58.7 microseconds, or millionths of a second, faster each day than on Earth, according to the White House memo. Nik Popli, TIME, 3 Apr. 2024 Sitting still, a muon decays into an electron, a neutrino, and an antineutrino in 2.2 microseconds. Byadrian Cho, science.org, 28 Mar. 2024 If anything, that fade better happen and that silence better be a microsecond before the next joint. Dalton Ross, EW.com, 28 June 2023 In terms of latency, the T700 showed a 13.9 percent improvement over the Samsung drive (31 versus 36 microseconds), according to PCMark 10 Storage results Tom's recorded. Scharon Harding, Ars Technica, 18 Apr. 2023 As Ars Science Editor John Timmer reported previously, FRBs involve a sudden blast of radio-frequency radiation that lasts just a few microseconds. Jennifer Ouellette, Ars Technica, 11 Oct. 2023

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'microsecond.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


International Scientific Vocabulary

First Known Use

1906, in the meaning defined above

Time Traveler
The first known use of microsecond was in 1906

Dictionary Entries Near microsecond

Cite this Entry

“Microsecond.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microsecond. Accessed 12 Jun. 2024.

Kids Definition


mi·​cro·​sec·​ond ˌmī-krō-ˈsek-ənd How to pronounce microsecond (audio)
: one millionth of a second

Medical Definition


mi·​cro·​sec·​ond ˈmī-krō-ˌsek-ənd, -ənt How to pronounce microsecond (audio)
: one millionth of a second

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