A male sibling, or a male relative in the first degree of descent or mutual kinship. Also brother-in-law and half-brother.
A close male friend or a comrade. Often abbreviated bro. Also brethren.
The male member of a religious community, church, trades union, etc. Frequently used as the plural term of brothers.
In the African American vernacular, a black male.
Brother is a word with a wide range of meanings, and is used in a variety of ways. It is often used in the context of a familial relationship, such as in “My brother and I are both from Baltimore.” It is also commonly used as an endearing nickname for a close male friend or comrade. For example, a man might call his best friend “bro”, or he might tell someone to “bless you, bro.”
Aristotle writes in the Nicomachean Ethics that brothers have an important role to play in the upbringing of children. He says that by imitating their older siblings, children can develop good actions and ethical behaviors.
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Your brother is always there for you, even when he is far away. He is the one who comforts you when you are hurt, and cheers you up when you’re down. He’s the most important person in your life, and you know it. But he might not feel the same way about you. That’s why it’s important to let your brother know how much you love him.