Ocean (noun)

1. A very large expanse of salt water that covers a major part of the earth's surface.
2. Any of the major divisions of this expanse, including the Atlantic, Pacific, Indian, Arctic, and Antarctic oceans.

Origin:

From old english ōcean, from latin oceanus "ocean", from greek ōkeanos "ocean", from proto-indo-european *h3ekw- "water".

Examples:

1. The ocean is a vast and mysterious place.
2. He loved to watch the waves of the ocean.
3. She took a cruise to explore the Caribbean ocean.
4. The ocean is home to a diverse range of marine life.
5. The ocean"s currents play a major role in the earth"s climate.