1. brothers, especially fellow members of a religious group or organization
Usage: formal; archaic plural of brother

Examples

• The minister addressed his brethren in the congregation.
• The monks lived peacefully with their brethren in the monastery.
• He called upon his brethren to support the cause.
• The fraternal organization welcomed new brethren into their ranks.
• The pastor spoke of love and unity among the brethren.
• All brethren were invited to attend the special ceremony.