noun
Honorific term for one's own older brother, used in formal or respectful speech.
大兄は現在、海外で働いています。
My older brother is currently working overseas.
pronoun
Honorific second-person pronoun used mainly in letters to address an older or same-aged male; formal and somewhat dated.
See also: 小弟
先日は大兄よりお手紙をいただき、ありがとうございました。
Thank you for the letter you sent the other day.