Korean Dictionary
How to say "Theory" in Korean
“Theory” in Korean is 이론 (pronounced "Ironon").
이론
Ironon
Usage & Context
A well-substantiated explanation supported by evidence. Korean scientists contribute to various scientific theories in physics, chemistry, and biology.
Example Sentence
이 이론은 널리 인정받고 있다.
This theory is widely accepted.
How to use 이론 naturally
Quick answer
The Korean word for “Theory” is 이론, romanized as Ironon.
Usage tip
Learn this word together with a complete Korean sentence. Meaning often depends on particles, politeness level, and word order.
Common mistake
Do not rely only on the English meaning. Read the Korean example sentence and notice the particles, word order, and politeness level around 이론.
Pronunciation Guide
Pronounced 'ee-ron' — 이 sounds like 'ee' (as in 'see'), and 론 like 'ron' with a gentle 'n' at the end. Two crisp syllables.
More Example Sentences
A physics lecture introduction.
아인슈타인의 상대성 이론은 물리학의 혁명이었다.
Einstein's theory of relativity was a revolution in physics.
A mentor giving career advice to a new employee.
이론과 실제는 다를 수 있어요.
Theory and reality can be different.
A science podcast discussing a controversial claim.
그 이론은 아직 증명되지 않았어요.
That theory has not yet been proven.
Cultural Context
이론 covers both scientific theory and more casual 'theory' talk — Koreans use '음모론' (conspiracy theory) and '썰' (informal theory/story) in daily chat. The common phrase '이론상으로는' ('in theory') is widely used in business and engineering to gently push back against unrealistic plans. In academic contexts, 이론 is paired with 실험 (experiment) or 실제 (practice) to contrast ideas with reality.
Editorial note
We review entries like 이론 for pronunciation, example sentence fit, and learner mistakes so the page answers more than a direct dictionary lookup.
Reviewed by Min-jung Park, Korean Language Teacher. Updated May 31, 2026. See our editorial standards.
Common Phrases
이론상으로는 가능해요.
In theory, it's possible.
이론과 실전은 달라요.
Theory and practice are different.
새로운 이론이 등장했어요.
A new theory has emerged.
Related Expressions
이론상
ironsang
In theory / theoretically
음모론
eummoron
Conspiracy theory
가설
gaseol
Hypothesis
원리
wolli
Principle
More Science & Research Words
Master Korean with AI-Powered Learning
Practice Theory and 10,000+ words with native pronunciation and AI conversation.
