the.com/brethren

Plural of brother, for when 'brothers' feels too casual for your sermon.

means An old-fashioned plural of 'brother,' used for members of a religious, fraternal, or otherwise tightly bonded group.

from From Old English 'brōthor,' which had an irregular plural 'brōthru.' By Middle English, this evolved into 'brethren,' using an old '-en' plural pattern (the same one that gave us 'children' and 'oxen'). Meanwhile, the everyday plural 'brothers' took over the regular '-s' pattern for ordinary use. English kept both: 'brothers' for the family at Sunday dinner, 'brethren' for the solemn, ceremonial, or spiritual kind — churches, lodges, and sermons claimed it and never let go.

usage zone
religious texts, oaths, and overwrought speeches
not plural rule
irregular, like children or oxen
modern brothers
replaced it everywhere except church and ceremony
gender note
technically includes sistren, rarely used
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