Entry 1 sense Webster, 1913 Britannic /brĭ-tănʹĭk/ · Bri·tan·nic · IPA /bɹɪˈtænɪk/ 01 a. Of or pertaining to Great Britain; British; as, her Britannic Majesty. 1. Of or pertaining to Great Britain; British; as, her Britannic Majesty.