研究社 新和英中辞典

りゆう 理由

(a) reason; cause

〈根拠〉 ground(s)

〈口実〉 a pretext; an excuse

充分な[薄弱な, 表面上の]理由

a good [a slender, 【形式ばった表現】 an ostensible] reason

理由のある

well‐founded[‐grounded]

理由のない

groundless

理由の立つ

justifiable

excusable

理由の立たない

unjustifiable

inexcusable

理由なく

without reason [cause, provocation] 〈不当に〉 unreasonably

…の理由で

by reason of…

for the reason of…

because of…

on account of…

on the grounds that…

いかなる理由で

for what reason

【形式ばった表現】 on what grounds

why

年少の理由で

in consideration of somebody's youth

considering that somebody is young [under age]

何らかの理由で

for some reason (or other).

用例

ちゃんとした理由があってそうしたのだ. He did so with good reason.｜He had the best of reasons for doing so. 失敗の理由は, 彼があせりすぎたということだ. The reason he failed was that [He failed because] he tried to do too much. 本校を特に選んだ理由を言って下さい. Will you please give your reasons for choosing this school? なぜそれが危険なのかその理由がわからない. I don't see why it should be dangerous.

斎藤和英大辞典

理由

読み方 りゆう

名詞

1

（＝訳柄）reason; cause; ground; score; account

用例

いかなる理由をもって辞職するのか
On what grounds do you wish to resign?―For what reason do you wish to resign?―What is your reason for wishing to resign?

かかる理由をもって辞職したいのです
On these grounds―For this reason―do I wish to resign―This is my reason for wishing to resign―This is the reason why I wish to resign.

彼は病気の理由をもって職を辞した
He resigned his post on the ground of failing health―on the score of ill health―on account of illness.

その動議は尚早の理由の下に否決された
The motion was rejected on the ground of prematureness.

彼は宗教上の理由をもって排斥せられた
He was rejected on religious grounds.

病気のほかはいかなる理由があっても決して学校を休むな
On no account must you absent yourself from school, unless you are ill.

何も謝罪すべき理由はあるまい
There is no reason why I should apologize―Why should I apologize?

なにも僕がやって悪いという理由はあるまい
I （can） see no reason why I should not try―why should I not try?

それが即ち僕の拒絶する理由である
That is the reason why I must refuse.

それは学校を休む理由とはならぬ
That is no reason for absenting yourself from school.

どうも彼があやしいと思われる理由がある
I have reason to suspect him―There is reason to suspect him.

いかにもそうと思われる理由がある
I have every reason to think that such is the case―There is every reason to believe that such is the case.

その理由を問うがよい
You ought to inquire the reason.

（承諾するか）さもなくばその理由を問う
Or I will know the reason why.

理由を述べる
to state one's reason

理由を申立てる
to allege one's reason

理由を設ける
to assign a reason （for doing anything）

理由を説明する
to give the reason

理由は説明の限りにあらず
The reason may or may not be given.

そう言っても立派に理由が立つ
There is good reason for saying so―I can give you good reason for saying so.

相当の理由無く解雇することはできぬ
We can not dismiss him without sufficient reason―without good cause.

彼の異様な行動は敵と内通していると仮定すべき理由となる
His strange conduct gives ground for the supposition that he is in secret communication with the enemy.

存在の理由
raison d'être―reason for being―right to be

そんな人間は存在の理由が無い
There is no raison d'être for such men.

これは理由無き攻撃だ
It is a gratuitous attack―a warranted attack.

理由書
a statement of reasons

2

（＝言い訳、口実）an excuse; a pretext; a justification

用例

僕の欠席は理由が立つ
My absence is justifiable―excusable.

病気だと言えば理由が立つ
My illness will serve as an excuse.

そんなことをしては理由が立たぬ
Such conduct is unjustifiable―inexcusable―Such conduct admits of no excuse―permits of no excuse―allows of no excuse.

酩酊の上とは言いながらあんなことをしては理由が立たぬ
Granting that he was drunk, that is no excuse for his behaviour.

どんな事情があっても暴行の理由は立たぬ
No circumstances can justify violence.

彼は何とかかんとか理由を設けて学校を休む
He absents himself from school on some pretext or other.

JMdict

理由

読み方：りゆう

（名詞） reason; pretext; motive

コンピューター用語辞典

理由

読み方 リユウ

cause; reason

参照

• 原因

JST科学技術用語日英対訳辞書

理由

reason; cause; ground

ライフサイエンス辞書

理由

***** りゆう

(n*) reason ****

(n*) cause ****

(n*) account ****

(prep) because ****

(conj) since ****

関連語

価値, 考える, 原因, 根拠, 判断, 引き起こす, わけ, だから, 以来, 原因となる, 取引, 計算書, アカウント, 成因

用例

reason for [〜の理由]

The underlying reason for this heterogeneity remains a mystery. (Mol Cell Biol)

The reasons for such a failure mode are identified and an alternative tensile bond strength test evaluated. (J Dent Res)

Cerebellar Purkinje cells are selectively vulnerable to ischemia, although the reasons for this are unknown. (J Neurosci)

We demonstrate here two reasons for that sensitivity. (Dev Biol)

reason why [〜である理由]

This study provides further reasons why preascitic patients with cirrhosis might benefit from sodium restriction. (Gastroenterology)

This appears to be the main reason why aged subjects have more difficulty in achieving automaticity. (J Physiol)

Nevertheless, there are two important reasons why the size of a constructed network should be limited. (Bioinformatics)

reason to do [〜する理由]

However, there are many reasons to suggest that these rhythms are more closely related than previously thought. (Circ Res)

There is no reason to suppose that the visual system contains motion sensors dedicated to the analysis of second-order motion. (Annu Rev Psychol)

There are four major reasons to perform SLN biopsy. (J Clin Oncol)

When rules are ambiguous, people look for reasons to guide their decisions. (Annu Rev Psychol)

for this reason [この理由のために]

For this reason, comparative studies and developmental studies are the best way of gaining insight into the evolutionary process. (Curr Opin Neurobiol)

For this reason, we have designated lipoprotein-9 GmpC, for glycylmethionine binding protein. (Biochemistry)

for these reason [これらの理由で]

For these reasons, we hypothesized that reduced levels of EGR1 would correlate with inferior outcome in patients with NSCLC. (J Clin Oncol)

For these reasons, the Hedgehog pathway has attracted considerable interest. (Genetics)

for a variety of reasons [種々の理由で]

The implementation of tamoxifen for this indication has not become widespread in clinical practice, however, for a variety of reasons that we discuss. (J Clin Oncol)

The quality of the epidemiological data on diabetic neuropathies remains poor for a variety of reasons. (Diabetes)

for the following reasons [以下の理由で]

Co-immunoprecipitation of IP3R isoforms was not due to cross-reactivity of the antibodies for the following reasons. (J Biol Chem)

The second procedure was performed for the following reasons: (1) elective double procedure in four patients, (2) relapse after first transplant in 20, (3) partial remission (PR) after first transplant in eight, and (4) refractory disease after first transplant in two. (J Clin Oncol)

用例

cause of [〜の原因]

Prostate cancer is the most common nonskin cancer and second most common cause of cancer mortality in US men. (JAMA)

Nephronophthisis (NPHP) is the most frequent genetic cause of chronic renal failure in children. (Nat Genet)

cause for [〜の原因]

The biochemical cause for this difference is unknown. (Oncogene)

be caused by [〜によって起こる]

Prion diseases are caused by an unconventional infectious agent termed prion, composed mainly of the misfolded prion protein (PrP(Sc)). (Nat Med)

hereditary nonpolyposis colorectal cancer (HNPCC) is caused by mutations resulting in defective DNA mismatch repair gene function. (Curr Opin Gastroenterol)

用例

because [なぜなら]

Because the absolute risk reduction is likely low, further investigation of the overall benefits of statins in preventing colorectal cancer is warranted. (N Engl J Med)

A ligand-bound odorant receptor has a low probability of activating even one G protein molecule because the odorant dwell-time is very brief. (Science)

because of [〜のために，〜の理由で]

Proteins do not naturally lend themselves to high-throughput analysis because of their diverse physiochemical properties. (Trends Biotechnol)

M. capsulatus, along with other methanotrophs, has been the subject of intense biochemical and molecular study because of its role in the global carbon cycle: the conversion of biogenic methane to carbon dioxide. (Trends Microbiol)

Many countries in Africa are considering a change to combination treatment for falciparum malaria because of the increase in drug resistance. (Lancet)

reasonの共起表現

causeの共起表現

accountの共起表現

becauseの共起表現

sinceの共起表現

日本語WordNet(英和)

理由

【名詞】

1 reason

論理上ある前提あるいは結論を正当化する事実

(a fact that logically justifies some premise or conclusion)

there is reason to believe he is lying 彼が嘘をついていると思う道理がある

2 justification

行動が妥当、または必要であるということを示すもの（事実や状況など）

(something (such as a fact or circumstance) that shows an action to be reasonable or necessary)

he considered misrule a justification for revolution 彼は、失政が革命のための理由であると考えていた

3 evidence, grounds

信じる、信じないの基礎となるもの

(your basis for belief or disbelief)

the evidence that smoking causes lung cancer is very compelling 喫煙が肺ガンの原因となるという証拠はとても説得力がある

4 reason

ある現象の原因の説明

(an explanation of the cause of some phenomenon)

the reason a steady state was never reached was that the back pressure built up too slowly 定常状態に決して到達しなかった理由は、背圧があまりにゆっくり積み重なったからであった

5 reason, ground

信念または行動の合理的な動機

(a rational motive for a belief or action)

the reason that war was declared 宣戦布告がなされた理由 the grounds for their declaration 彼らの宣言の根拠

6 why, wherefore

行動または状況の根底にある原因または意図を指し、特に『the whys andwherefores』という句で用いる

(the cause or intention underlying an action or situation, especially in the phrase `the whys and wherefores')

>>「理由」に関する類語一覧

EDR日英対訳辞書

理由

読み方 リユウ

the whys and the wherefores

日英・英日専門用語辞書

理由

causa，occasion

日英固有名詞辞典

理由

日本人名前

読み方	英語式	ヘボン式	訓令式	ワープロ式
りゆ	Riyu	Riyu	Riyu	Riyu

クロスランゲージ 37分野専門語辞書

理由

cause; reason; occasion; ground; account; justification; grounds; causa

JMnedict

理由

	読み方	意味・英語表記
理由	みちよし	Michiyoshi

JMnedictは、日本語の一般的な固有名詞の分類とそれを英語で表記した内容を中心に扱っています。
同じ日本語に複数の英語表記が表示される項目もあります。

Weblio英和対訳辞書

理由

reason

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理由 (1995年の映画)

Just Cause (film)

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