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例文
They had good reason to rejoice.
彼らには、歓喜するもっともな理由があった。
The reason that war was declared.
宣戦布告がなされた理由。
The assumed reason for his absence.
彼の欠席への推測される理由。
補足(英英和)
  • the capacity for rational thought or inference or discrimination; "we are told that man is endowed with reason and capable of distinguishing good from evil"合理的思考、推理、あるいは識別の能力知性
    例:We are told that man is endowed with reason and capable of distinguishing good from evil. 人間には理性が授けられ、善と悪を区別できると教えられる。
  • the state of having good sense and sound judgment; "his rationality may have been impaired"; "he had to rely less on reason than on rousing their emotions"分別があり的確な判断ができること道理をわきまえていること
    例:He had to rely less on reason than on rousing their emotions. 彼は情緒をかき乱すことよりも理性に訴えなくてはならない。
  • 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"ある現象の原因の説明道理
    例: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。
  • a justification for something existing or happening; "he had no cause to complain"; "they had good reason to rejoice"存在している、または起こっている何かを正当化する理由弁明
    例:They had good reason to rejoice. 彼らには、歓喜するもっともな理由があった。
  • a rational motive for a belief or action; "the reason that war was declared"; "the grounds for their declaration"信念または行動の合理的な動機訳柄
    例:The reason that war was declared. 宣戦布告がなされた理由。
Amazon
Bridget Jones: The Edge of Reason
The Reason for a Flower