Dictionary.net

a male person who is a fellow member (of a fraternity or religion of other group); "none of his brothers would betray him"

(Roman Catholic Church) a title given to a monk and used as form of address; "a Benedictine Brother"

a male person who is a fellow member (of a fraternity or religion of other group); "none of his brothers would betray him"

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 who, or that which, resembles another in distinctive qualities or traits of character.

To make a brother of; to call or treat as a brother; to admit to a brotherhood.

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 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 who, or that which, resembles another in distinctive qualities or traits of character.

To make a brother of; to call or treat as a brother; to admit to a brotherhood.

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 male who has the same father and mother as another; one closely united to another by a common interest; a member of a religious order; a fellow creature.

A male born of the same parents: any one closely united with or resembling another: a fellow-creature; also, in certain religious, beneficial, and secret societies, a fellow member. (Amer.).

A son of the same parents; a close associate.

Brotherhood.

A son of the same parents or parent; a close companion or associate.

n. [Anglo-Saxon] He who is born of the same father and mother with another;—one closely united to another by some common tie or interest;—one who resembles another in manners or traits of character.

One born of the same father or mother; any one closely united; any one resembling another in manner, form, or profession; Brother is used in theological language, for man in general.