Pronunciation: (ō"shē-an'ik),[key] —adj. 1. of, living in, or produced by the ocean: oceanic currents. 2. of or pertaining to the region of water lying above the bathyal, abyssal, and hadal zones of the sea bottom. Cf. neritic, pelagic. 3. immensely large; vast: an oceanic expanse of stars. 4. (cap.) of or pertaining to Oceania, its peoples, or their languages.