"brethren" in the noun sense
1. brother, blood brother
a male with the same parents as someone else
"my brother still lives with our parents"
2. brother
a male person who is a fellow member (of a fraternity or religion or other group
"none of his brothers would betray him"
3. buddy, brother, chum, crony, pal, sidekick
a close friend who accompanies his buddies in their activities
4. brother, comrade
used as a term of address for those male persons engaged in the same movement
"Greetings, comrade!"
5. Brother
Roman Catholic Church) a title given to a monk and used as form of address
"a Benedictine Brother"
Source: WordNet® (An amazing lexical database of English)
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