Oceanic/ˌəʊʃiˈænɪk/ Definition 1 of 3Pro Tip 1/3Environment Context Used when discussing natural ocean environments or ecosystems. The oceanic habitat is home to a diverse range of species. Pro Tip 2/3Geographical Extent Emphasizes geographical zones influenced by the ocean. Oceanic islands are formed by volcanic activity. Pro Tip 3/3Not Freshwater Clarifies that 'oceanic' is exclusively related to saltwater bodies. Oceanic fish differ from freshwater species.