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The character 悌, denoting fraternal piety in Confucian ethics, is a phono-semantic compound formed by the semantic component 心 (heart) indicating its relation to inner disposition, and the phonetic component 弟 (younger brother) which also contributes semantically by referencing the sibling relationship. Etymologically, this character evolved from the earlier use of 弟 alone to express the concept of respectful submission among brothers, with the addition of 心 creating a distinct graph to emphasize the virtuous mindset. While its core meaning historically focused on a younger brother's duty toward his elder siblings, the concept broadened over centuries to imply reciprocal harmony and ethical conduct within all fraternal relationships.
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