Learner's definition of OCEAN
1 [noncount] : the salt water that covers much of the Earth's surface — often used with the
— often used before another noun
They lived near the ocean. [=the sea]
He had never seen the ocean before.
There's a storm moving in from the ocean.
The ship quickly sank to the bottom of the ocean.
the deepest parts of the ocean
orOcean : one of the five large areas of salt water that cover much of the Earth's surface
3 [count], informal : a very large number or amount of something — often plural