1 of a brother or brothers.
2 suitable to a brother; brotherly.
3 (of twins) developed from separate ova and not necessarily closely similar.
4 US of or concerning a fraternity (see FRATERNITY 3).
Derivatives:
fraternalism n. fraternally adv.
Etymology: med.L fraternalis f. L fraternus f. frater brother
Useful english dictionary. 2012.