brethren

"Brethren" isn't something you hear in casual conversation today. It is the archaic plural of "brother." While we now use "brothers" for biological siblings, "brethren" has come to mean people linked by shared faith, calling, or solemn purpose. You'll often see it in early Quaker writings, older legal and religious usage, and within the King James Bible. Some formal or fraternal bodies, including Masonic communities and church traditions, still use it to mean their members. It usually carries a tone of fellowship, loyalty, and shared identity, stronger than mere friendship.

The word "brethren" carries a rich history rooted in both kinship and faith. In Middle English it was the standard plural form of "brother." As English changed, "brothers" became the everyday term for male siblings, while "brethren" narrowed toward people united by a spiritual, fraternal, or professional bond. The word suggests a kind of metaphorical kinship, where the bond between members is as strong as family ties.

Historically, "brethren" is most prominent in religious contexts. It was the standard form of address in early Bible translations and remains the name of several Christian denominations, such as the Plymouth Brethren. Within these communities, the word signifies a shared commitment to a set of divine principles. Beyond religion, the term is used by fraternal organizations and guilds to emphasize unity and mutual respect among their members.

In a modern, figurative sense, you might encounter it when describing a group of people united by a common struggle or profession—for instance, "brethren of the bar" (lawyers) or "brethren in arms" (soldiers). While using "brethren" today can sound archaic or overly formal, it is the perfect choice when you want to emphasize a deep, traditional, and serious connection between people who share a common cause.