# Eureka

/jʊˈɹikə/ (US) · /juːɹˈiːkɐ/ (UK) · CEFR C1 · Interjection

Source: https://englishreference.com/word/eureka
Updated: 2026-05-06

## Definition

a word you shout when you suddenly find the answer to a problem or make a great discovery.

For teachers: an exclamation used to celebrate a sudden discovery or the successful solution to a problem. Derived from the Greek for 'I have found it'.

## Examples

- Eureka! I finally found my lost keys.
- After hours of staring at the complex math problem, she shouted 'Eureka!' as the solution became clear.
- The scientist experienced a true eureka moment when the results of the final experiment confirmed his long-standing hypothesis about cellular regeneration.

## Usage notes

- Often used as a standalone exclamation or to modify the noun 'moment'.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.