【下位】 a younger brother; "my little brother just had his 50th birthday" 弟。
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a male person who is a fellow member (of a fraternity or religion or other group); "none of his brothers would betray him" （友愛会、宗教、またはその他のグループの）仲間である男性。
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【上位】 one of the persons who compose a social group (especially individuals who have joined and participate in a group organization); "only members will be admitted"; "a member of the faculty"; "she was introduced to all the members of his family" ある社会のグループを構成している人の1人（特に団体に加わり参加している個人）。
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