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Definitions

eureka

[yoo-ree-kuh, yuh-] / yʊˈri kə, yə- /
NOUN
surprise
Synonyms
STRONGEST
amazement astonishment awe bewilderment consternation curiosity disappointment jolt miracle revelation shock wonder
STRONG
abruptness attack bombshell disillusion epiphany fortune godsend incredulity kick marvel miscalculation phenomenon portent precipitance precipitation precipitousness prodigy rarity start stupefaction suddenness thunderbolt whammy wonderment
WEAK
astoundment curveball eye-opener unexpected unforeseen
Antonyms
STRONGEST
calmness composure coolness expectation happiness indifference

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.

This is the passage that zapped Ms. Prose with her eureka moment.

From The Wall Street Journal • May 1, 2026

I think my first eureka moment was when I was traveling in sub-Saharan Africa on the Ivory Coast doing a site visit.

From Barron's • Mar. 5, 2026

He has supported people in the community "four, five, six times before you get that eureka moment and you don't see them again."

From BBC • Dec. 10, 2025

"It's one of those eureka moments that you think 'nature is trying to tell us something here.'"

From Science Daily • Oct. 16, 2025

Hudson leans in, puts his fist underneath his chin, and stares off into the sky like he’s just had the most epic eureka moment and is now ready to remake the world.

From "What If It's Us" by Becky Albertalli and Adam Silvera