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(archaic) plural of brother
(poetic) kinsmen examples
plural only
(figuratively) The body of members, especially of a fraternal, religious or military order. examples
comparative more brethren, superlative most brethren
Of or akin to; related; like quotations examples
The principle still sounds good, but our astronomical knowledge is limited, and we haven't yet discovered any such brethren solar systems.
2009, Seth Shostak, Confessions of an Alien Hunter