B1 noun Neutral

理論

/ɾiɾoɴ/

A supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.

Examples

3 of 5
1

経済学の理論を実際のビジネスに応用する。

Apply economic theories to actual business.

2

彼の話は理論的には正しいが、実行は難しい。

His story is theoretically correct, but execution is difficult.

3

新しい学習理論に基づいた教材を作る。

Create teaching materials based on a new learning theory.

Word Family

Noun
理論
Adverb
理論的に
Adjective
理論的な
💡

Memory Tip

Ri (reason) + Ron (argument) = A reasoned argument/system.

Quick Quiz

この研究は、ダーウィンの進化( )に基づいている。

Correct!

The correct answer is: 理論

Examples

1

経済学の理論を実際のビジネスに応用する。

academic

Apply economic theories to actual business.

2

彼の話は理論的には正しいが、実行は難しい。

formal

His story is theoretically correct, but execution is difficult.

3

新しい学習理論に基づいた教材を作る。

business

Create teaching materials based on a new learning theory.

4

理論ばかりで実践が伴っていない。

everyday

It's all theory and no practice.

5

その理論、ちょっと難しすぎない?

informal

Isn't that theory a bit too difficult?

Word Family

Noun
理論
Adverb
理論的に
Adjective
理論的な

Common Collocations

理論を立てる to form a theory
理論的背景 theoretical background
理論武装 theoretical arming (preparing logic)
〜の理論 theory of...
理論上は in theory

Common Phrases

理論を構築する

to construct a theory

机上の理論

desk theory (armchair theory)

理論を裏付ける

to support a theory

Often Confused With

理論 vs 論理

Riron is a specific academic theory; Ronri is the concept of logic or reasoning.

📝

Usage Notes

Essential for discussing academic concepts and scientific frameworks.

⚠️

Common Mistakes

Don't confuse with 'ronri' (logic). Use 'riron' for a set of rules or an academic 'Theory'.

💡

Memory Tip

Ri (reason) + Ron (argument) = A reasoned argument/system.

📖

Word Origin

Sino-Japanese: 'ri' (reason/principle) + 'ron' (argument).

Grammar Patterns

理論的には〜 〜という理論

Quick Quiz

この研究は、ダーウィンの進化( )に基づいている。

Correct!

The correct answer is: 理論

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