Depending on what you mean, there are two definitions.
Ikhwia or "أخوية" means "Brotherhood" when it means a sentiment. (I.e. They lived together in brotherhood.)
Ikhwaan or "اخوان" means "Brotherhood" when it refers to an organization. (I.e. We both joined the Brotherhood when we turned 15.)
brotherhood : ukhuwwa اخوّة brother : akh اخ brothers : ikhwaan اخوان
(الاسم) أخوة, اخاء, رباط الأخوة‏)
In Arabic, "ekhi" (أخي) means "my brother." It is a term of endearment and camaraderie used to refer to a male sibling or close male friend. The word is derived from "akh" (أخ), which simply means "brother." In different contexts, it can also convey a sense of solidarity and brotherhood among men.
brotherhood
BRotherHood!
mason
Muslim Brotherhood was created in 1928.
Brotherhood of the Kingdom was created in 1892.
Brotherhood of the Epiphany was created in 1879.
Brotherhood of Dada was created in 1989.
Brotherhood of Hope was created in 1980.
Second Brotherhood happened in 1693.