Jisho

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りせい 理性
Common word JLPT N1 Wanikani level 14 Show 2 collocations Links
Noun
1. reason; reasoning power; (one's) sense​
Wikipedia definition
2. Reason​Reason is a term that refers to the capacity human beings have to make sense of things, to establish and verify facts, and to change or justify practices, institutions, and beliefs. It is closely associated with such characteristically human activities as philosophy, science, language, mathematics, and art, and is normally considered to be a definitive characteristic of human nature.
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