mi·​cro·​sec·​ond | \ ˈmī-krō-ˌse-kənd How to pronounce microsecond (audio) , -kənt \

Definition of microsecond

: one millionth of a second

Examples of microsecond in a Sentence

Recent Examples on the Web The question of leap seconds is contentious, because some scientists believe simply adjusting each day’s microsecond difference is better. Caroline Delbert, Popular Mechanics, "Why Scientists Want to Shorten the Minute to 59 Seconds," 11 Jan. 2021 Within a fraction of a microsecond, the electron and the positron collide and annihilate each other in a flash of gamma rays. Adrian Cho, Science | AAAS, "Tantalizing oddity found in exotic atom—but physicists aren’t hyping it," 25 Aug. 2020 In the next microsecond, the cop, his eyes burning with fear, pulled and pointed his M9 Berretta two inches from my forehead. Tom Stienstra, San Francisco Chronicle, "Ten life-and-death moments in columnist Tom Stienstra’s 40 years in the outdoors," 30 June 2020 The next step in the build required Keegan to look down for just a microsecond. August Cole, Wired, "AI, AR, and the (Somewhat) Speculative Future of a Tech-Fueled FBI," 5 June 2020 But under the extreme high-energy conditions of the early Universe in its first microseconds of existence, that couldn't happen. Jennifer Ouellette, Ars Technica, "Physicists identify unique signature to confirm quark-gluon plasma in Universe," 1 May 2020 With careful engineering and problem solving, the company has increased clock accuracy from within 10 milliseconds to within 100 microseconds. Caroline Delbert, Popular Mechanics, "Facebook Just Made a Time Syncing Breakthrough," 18 Mar. 2020 And that's a problem, because the typical lifetime of a qubit stored in this memory is 70 microseconds, much shorter than the entanglement process. John Timmer, Ars Technica, "Researchers entangle quantum memory at facilities over 50km apart," 12 Feb. 2020 At the time, Agriculture Secretary Sonny Perdue said the change would address the head start of a few microseconds that can amount to a market advantage. Eric Morath, WSJ, "U.S. to Change How It Releases Economic Data," 16 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'microsecond.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of microsecond

1906, in the meaning defined above

History and Etymology for microsecond

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Time Traveler for microsecond

Time Traveler

The first known use of microsecond was in 1906

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Cite this Entry

“Microsecond.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/microsecond. Accessed 13 May. 2021.

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English Language Learners Definition of microsecond

: one millionth of a second
informal : a very short period of time


mi·​cro·​sec·​ond | \ ˈmī-krō-ˌsek-ənd, -ənt How to pronounce microsecond (audio) \

Medical Definition of microsecond

: one millionth of a second

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