Definition of ocean noun from the Oxford Advanced American Dictionary

      

    ocean

     noun
    noun
    NAmE//ˈoʊʃn//
     
     
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  1. 1 the ocean [singular] the mass of salt water that covers most of the earth's surface the depths of the ocean People were swimming in the ocean despite the hurricane warning. The plane hit the ocean several miles offshore. Our beach house is just a couple of miles from the ocean. an ocean liner Ocean levels are rising.
  2. 2Ocean [countable] one of the five large areas that the ocean is divided into the Antarctic/Arctic/Atlantic/Indian/Pacific Ocean
  3. Idioms
    an ocean of something(also oceans of something)(informal)
     
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    a large amount of something
See the Oxford Advanced Learner's Dictionary entry: ocean