a large body of water constituting a principal part of the hydrosphere
"The satellite imagery revealed that even in the deepest trenches, the ocean remains an interconnected vast body of water covering most of our planet."
One of the large bodies of water separating the continents.
"The ship sailed across the vast ocean to reach its destination in another continent."
In plain English: An ocean is a huge body of saltwater that covers most of the Earth's surface.
"We spent the whole afternoon building sandcastles on the ocean beach."
Usage: Use "ocean" to refer to the vast global bodies of saltwater that cover most of Earth's surface and separate landmasses. Do not use it to describe small lakes, rivers, or private swimming pools.
A female given name from English of modern usage.
"She decided to name her daughter Ocean after a friend who had suggested it as a fresh, nature-inspired choice."
The word "ocean" entered Middle English from Old French and ultimately derives from the Latin name for a specific water deity in Ancient Greek. It replaced an earlier native Old English term to describe the vast body of saltwater surrounding the land.