a division of an ocean or a large body of salt water partially enclosed by land
"The ship navigated through calm waters in the South Sea before reaching the open Pacific."
A large body of salt water.
"The captain steered the ship toward the open sea to catch better winds."
The ocean; the continuous body of salt water covering a majority of the Earth's surface.
"After years of living inland, she finally felt her heart settle when she stood on the deck overlooking the vast expanse of sea stretching to the horizon."
In plain English: A sea is a large body of saltwater that covers most of the Earth's surface and connects to the ocean.
"We spent the whole afternoon swimming in the sea."
Usage: Use "sea" to refer specifically to vast bodies of salty water, such as the Mediterranean Sea or the open ocean beyond coastal waters. Avoid using it interchangeably with generic terms like "water," which lacks this specific geographic and saline context.
Abbreviation of Seattle.
"The new headmaster, Mr. Sea, greeted us warmly at the school gates."
A surname.
The word "sea" comes from Old English, originally meaning a body of water. Its ultimate roots trace back to ancient terms describing something fierce or wild.