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Definitions

momentary

[moh-muhn-ter-ee] / ˈmoʊ mənˌtɛr i /
ADJECTIVE
brief, fleeting
Synonyms
STRONGEST
short-lived temporary transitory
WEAK
cursory dreamlike ephemeral evanescent flashing flitting flying fugacious fugitive gone in flash hasty impermanent impulsive in wink of an eye instantaneous like lightning passing quick shifting short spasmodic summary transient vanishing volatile
Antonyms
STRONGEST
lasting lengthy long-lived permanent
WEAK
long-lasting staying

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.

Other cyber stocks saw a momentary lift the week, but that optimism didn’t last long.

From Barron's • Apr. 9, 2026

Speaking to the BBC last year, she admitted to a momentary crisis of confidence.

From BBC • Mar. 26, 2026

Observing that momentary disappearance allows scientists to calculate the asteroid's position, speed, and shape with remarkable precision.

From Science Daily • Mar. 9, 2026

The final update was from Jan. 18, after she had emergency surgery to remove that tumor, and her mood was one of momentary relief.

From Los Angeles Times • Mar. 4, 2026

The momentary excitement had taken Owen’s mind off the cold, but now he felt the wind and snow coming right down the metal pipe.

From "Two Degrees" by Alan Gratz