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理論
りろん
What does "理論" mean in English?
theoryこの理論は科学的な根拠に基づいています。
This theory is based on scientific evidence.
How to use "理論" correctly: definitions and examples in English?
formal
A systematic explanation or set of principles intended to explain phenomena or events.
アインシュタインの相対性理論は物理学の基盤です。
Einstein's theory of relativity is the foundation of physics.
Often used in academic and scientific contexts to describe hypotheses or frameworks.
informal
A speculative idea or belief that lacks empirical evidence.
彼は奇妙な理論を持っているが、証明されていない。
He has a strange theory, but it's not proven.
In informal contexts, it can refer to unproven or unconventional ideas.
Related Phrases
Pro Tip
Formal vs. Informal Use
In formal contexts, '理論' refers to well-established scientific or academic theories. In informal contexts, it can imply speculative ideas.
Gold Rule
Scientific Context
When discussing science or academia, '理論' typically refers to a well-supported explanation of phenomena.
Word Origin
From the Chinese characters 理 (reason, principle) and 論 (theory, doctrine).
Usage Notes
In Japanese, '理論' is often used in formal academic or scientific discussions. In everyday conversation, it can sometimes imply a speculative or unproven idea.
Word Breakdown
理
reason, principle
root論
theory, doctrine
root和英辞典