Brethren
This word, being the plural of Brother in the solemn style, is more generally used in Masonic language, instead of the common plural, Brothers. Thus Masons always speak of "The Brethren of the Lodge," and not of "The Brothers of the Lodge."
Of late, many Brothers (of all ranks) have taken to use the word 'Brothren' instead of 'Brethren'. Please note that 'Brothren' is not an English word.
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This page is adapted from the Glossary at Phoenixmasonry — Used with permission.