1
a
: a great body of salt water that covers much of the earth
broadly
: the waters of the earth as distinguished from the land and air
b
: a body of salt water of second rank more or less landlocked
the Mediterranean sea
c
: ocean
d
: an inland body of water
—used especially for names of such bodies
the Caspian Sea
2
a
: surface motion on a large body of water or its direction
also
: a large swell or wave
—often used in plural
heavy seas
b
: the disturbance of the ocean or other body of water due to the wind
3
: something likened to the sea especially in vastness
a sea of faces
4
: the seafaring life
5
sea
adjective
Examples of sea in a Sentence
the seas of the Southern Hemisphere
millions of plants and animals live in the sea
Recent Examples on the Web
During the spring and early fall, travelers can enjoy mild temperatures, calm seas, and fewer crowds.
—
Mina Agnos, Travel + Leisure, 13 July 2025
Des pite the challenges of enforcement in a vast sector where goods are often shipped in covert ways by busy air and sea routes, observers also say that more can be done in China.
—Simone McCarthy, CNN Money, 12 July 2025
In addition to sheer size, the Liberty Lifter was meant to be able to take off and land in State 4 sea conditions (waves 1.25 to 2.5 m/4 ft 1 in to 8 ft 2 in) and handle on-water operations in State 5 (waves 2.5 to 4 m/8 ft 2 in to 13 ft 1 in).
—New Atlas, 11 July 2025
Bright streaks of material can be seen marking the dark 'lunar seas', created when reflective material was cast far across the lunar surface by cataclysmic asteroid strikes in the distant past.
—Anthony Wood, Space.com, 11 July 2025
See All Example Sentences for sea
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Mina Agnos, Travel + Leisure, 13 July 2025
Des pite the challenges of enforcement in a vast sector where goods are often shipped in covert ways by busy air and sea routes, observers also say that more can be done in China.
—Simone McCarthy, CNN Money, 12 July 2025
In addition to sheer size, the Liberty Lifter was meant to be able to take off and land in State 4 sea conditions (waves 1.25 to 2.5 m/4 ft 1 in to 8 ft 2 in) and handle on-water operations in State 5 (waves 2.5 to 4 m/8 ft 2 in to 13 ft 1 in).
—New Atlas, 11 July 2025
Bright streaks of material can be seen marking the dark 'lunar seas', created when reflective material was cast far across the lunar surface by cataclysmic asteroid strikes in the distant past.
—Anthony Wood, Space.com, 11 July 2025
See All Example Sentences for sea
Cite this Entry
“Sea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sea. Accessed 17 Jul. 2025.
Copy CitationKids Definition
sea
noun1
a
: a great body of salty water that covers much of the earth
also
: the waters of the earth
b
: a body of salt water not as large as an ocean
the Mediterranean Sea
c
d
: an inland body of water either salt or fresh
the Sea of Galilee
2
: rough water
a high sea swept the deck
3
: something suggesting the sea (as in great size or depth)
a golden sea of wheat
4
: a life involving marine travel
hoped to make a career of the sea
5
sea
adjective
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