A male person who has the same father and mother with another person, or who has one of them only. In the latter case he is more definitely called a half brother, or brother of the half blood.

One related or closely united to another by some common tie or interest, as of rank, profession, membership in a society, toil, suffering, etc.; -- used among judges, clergymen, monks, physicians, lawyers, professors of religion, etc.

a man who is a member of a religious order, but is not ordained. A Brother takes vows of poverty, chastity and obedience. He usually lives in community and is involved in some form of ministry or an apostolate.

A male sibling, or a half brother, stepbrother, brother-in-law, husband of a sister-in-law, or a "Brother" in the Church (more common in Protestant terminology). This term is also sometimes used to show close friendship and has nothing to do with a family relationship.

a close friend who accompanies his buddies in their activities

a better defense than a strong city , and a friend is like the bars of a castle

a friend given by God

a friend given by Nature

Common term used by the Kalkars; i.e.., Brother Or-tis; used in the sense that ‘all men are brothers' which translates as ‘good citizens and loyal to the Jemadar.' (probably meant to be satirical of the Russian communist using the word ‘comrade' before a surname.) [MMa

used as a term of address for those male persons engaged in the same movement; "Greetings, comrade!"

Brother is a 2000 film starring, written, directed and edited by Japanese filmmaker, Takeshi Kitano. It is also his fifth collaboration with renowned Japanese composer Joe Hisaishi. This was also Kitano's first collaboration with designer, Yohji Yamamoto.

Brother (Russian: Брат, Brat) is a 1997 crime film directed by Aleksei Balabanov and starring Sergei Bodrov Jr.. The film quickly became a popular hit in Russia and announced a new generation of Russian filmmaking had arrived. It's a simple yet compelling tale.