Pronunciation (UK) IPA (key): /ˈəʊ.ʃən/ (US) IPA (key): /ˈoʊ.ʃən/ Audio (US)(file) Noun Singular ocean Plural oceans (countable) An ocean is a large area of salt water. My great grandfather came across the Atlantic ocean from Scotland to Canada in 1882 on a sailing ship. She stood on a beach in Japan and looked east at the sun coming up over the Pacific ocean. Related words sea Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads