Entry 1 sense Webster, 1913 Fraternal /frət-ẽrn'-əl/ · Fra·ter·nal · IPA /fɹəˈtɝnəl/ 01 a. Of, pertaining to, or involving, brethren; becoming to brothers; brotherly; as, fraternal affection; a fraternal embrace. 1. Of, pertaining to, or involving, brethren; becoming to brothers; brotherly; as, fraternal affection; a fraternal embrace. “An abhorred, a cursed, a fraternal war.” — Milton. “Fraternal love and friendship.” — Addison.