split-second

1 of 2

adjective

split-sec·​ond ˈsplit-ˈse-kənd How to pronounce split-second (audio)
1
: occurring in a split second
a split-second decision
2
: extremely precise
split-second timing

split second

2 of 2

noun

: a fractional part of a second : flash

Examples of split-second in a Sentence

Adjective a day trader who is used to making split-second decisions Noun In a split second, it was all over. a devastating accident can cause everything in your life to change in a split second
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Adjective
This would cause problems for global infrastructure like satellite navigation, military systems and global financial markets that rely on split-second precision. Alice Gibbs, MSNBC Newsweek, 10 July 2025 In a split-second decision, Moales says he’s overcome with adrenaline. Rebecca Pryor, Baltimore Sun, 9 July 2025
Noun
The two were able to team up for a split second to get Nia Jax out of the way. Ryan Gaydos, FOXNews.com, 14 July 2025 The justices must decide whether courts should assess everything that happened during the traffic stop or just the split seconds when the officer feared for his safety. Ella Lee, The Hill, 2 June 2025 See All Example Sentences for split-second

Word History

First Known Use

Adjective

1944, in the meaning defined at sense 1

Noun

1912, in the meaning defined above

Time Traveler
The first known use of split-second was in 1912

Browse Nearby Words

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Cite this Entry

“Split-second.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/split-second. Accessed 19 Jul. 2025.

Kids Definition

split second

1 of 2 noun
: a small fraction of a second : flash

split-second

2 of 2 adjective
1
: occurring in a split second
a split-second decision
2
: extremely precise
split-second timing
Last Updated: - Updated example sentences
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