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.
Rowland Brotherhood died in 1883.
Rowland Brotherhood was born in 1812.
Brotherhood of Blood was created in 2007.
The Scarlet Brotherhood was created in 1999.
Brotherhood of Man was created in 1969.