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Definitions

split second

NOUN
very short time
Synonyms
STRONGEST
blink of an eye millisecond nanosecond
WEAK
bat of an eye flash fraction of a second half a second heartbeat instant jiffy microsecond moment nothing flat twinkling
ADJECTIVE
extremely fast
Synonyms
STRONG
fast instant on-the-spot quick quick-fire rapid speedy

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

For very small particles, the entire event lasts only a split second before the material completely burns up.

From Science Daily • May 14, 2026

"It all happened so fast, in a split second," Sausan recounted.

From Barron's • Apr. 27, 2026

"I do think playing them can be more mindful than other games that require lots of cognitive engagement to coordinate with teammates or react in a split second."

From BBC • Apr. 3, 2026

For a split second it felt like I had neither.

From The Wall Street Journal • Jan. 8, 2026

There was a split second when it looked like Noah was unaware of where he was or how to form words.

From "Here to Stay" by Sara Farizan

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