Translation guide
The English word 'coherent' describes something that is logical, consistent, and easy to understand. In Japanese, there is no single direct equivalent; the best translation depends on whether you are describing an argument, a plan, a story, or a person's speech. This guide organizes the most natural Japanese expressions by these contexts.
To describe an argument, explanation, or set of ideas that is well-organized and makes sense.
Literally 'the logic passes through.' This is the most common and natural way to say an argument or reasoning is coherent. It implies internal consistency.
彼の説明は筋が通っている。
His explanation is coherent.
A more formal, written term meaning 'consistent from beginning to end.' Often used in academic or business contexts.
首尾一貫した政策が必要だ。
A coherent policy is necessary.
Means 'logical.' It can be used for coherent reasoning, but it emphasizes logic over overall consistency.
彼の主張は論理的だ。
His argument is coherent (logical).
Means 'to be consistent' or 'to add up.' Often used when checking if details or stories match. Slightly more casual.
彼の話はつじつまが合わない。
His story isn't coherent (doesn't add up).
To describe spoken or written content that is well-structured and understandable.
Literally 'easy to understand.' This is the most natural way to say speech or writing is coherent in the sense of being clear.
彼のプレゼンはとても分かりやすかった。
His presentation was very coherent (easy to follow).
Means 'to be organized' or 'to have cohesion.' Used for essays, speeches, or thoughts that are well put together.
このレポートはまとまりがある。
This report is coherent.
Means 'clear and lucid.' Often used for explanations or writing that is easy to grasp.
明快な文章を書く。
Write coherent sentences.
To describe particles, substances, or groups that are united or stick together.
A technical term used in physics or chemistry meaning 'cohesive' or 'coherent' (as in light waves). Rare in everyday language.
レーザー光は凝集性が高い。
Laser light is highly coherent.
Means 'combined' or 'united.' Can be used for coherent groups or structures, but is not specific to coherence.
結合したシステム
a coherent system
There is no single Japanese word that covers all uses of 'coherent.' Translating it as コヒーレント (the loanword) is only used in physics contexts (e.g., coherent light). For everyday logic or clarity, use the phrases above.
Both mean 'consistent,' but 筋が通っている focuses on logical flow, while つじつまが合う focuses on factual consistency (e.g., alibi, details matching). Use 筋が通っている for arguments, and つじつまが合う for stories or accounts.