ocean

noun

ˈō-shən 

plural oceans

often attributive

1

a

: the whole body of salt water that covers nearly three fourths of the surface of the earth

The ocean covers most of our planet, regulates our weather and climate, absorbs vast amounts of carbon dioxide, provides most of our oxygen, and feeds much of the human population.

—National Oceanic and Atmospheric Administration

b

: any of the large bodies of water into which the great ocean is divided

the oceans of the world

2

: a very large or unlimited quantity or expanse

Could have made oceans of money.

—James Joyce

He would have oceans of time for his ride.

—P. G. Wodehouse

Jutting from an ocean of prairie, they [the Sangre de Cristo mountains] run north-south like an iguana spine …

—Skiing

Synonyms

• blue
• brine
• deep
• Neptune
• sea
• seven seas

Examples of ocean in a Sentence

We've sailed across hundreds of miles of ocean.

the Pacific and Indian oceans

Recent Examples on the Web

Manmade sources of nutrients, such as nitrogen and phosphorus, can seep into ocean waters and encourage the growth of algae blooms, according to the Centers for Disease Control and Prevention. —Julia Jacobo, ABC News, 24 Apr. 2025

Courtesy of The Edition The Miami Beach Edition is somehow both a sanctuary and a social haven: their spacious guest rooms are adorned in warm calming neutrals and pale woods, many with balconies that look over the ocean. —Elise Taylor, Vogue, 24 Apr. 2025

The carbonic acid is converted to a mineral called bicarbonate, which cannot re-gas to the atmosphere and eventually is washed into the ocean, where it is stored for about 10,000 years. —Ross Rosenfeld, MSNBC Newsweek, 23 Apr. 2025

And the pas de deux turns out to be the central metaphor of a series built on dualities, power struggles, romances, the attraction of opposites, the narcissism of small differences that divide counterparts on either side of an ocean. —Judy Berman, Time, 23 Apr. 2025

Word History

Etymology

Middle English occean "the sea flowing around the land mass of the known world," borrowed from Anglo-French, borrowed from Latin Ōceanus, borrowed from Greek Ōkeanós, probably of pre-Greek substratal origin

Note: Preserved variants of Greek Ōkeanós, as Ōgḗn, Ōgenós, Ōgēnós, may indicate that the velar stop, whatever its original voicing, was palatalized (hence *ūkʸān-?)—strongly suggesting non-Indo-European origin. Old attempts to find an Indo-European origin (as a comparison with Sanskrit ā-śayāna- "lying on") are unconvincing.

First Known Use

14th century, in the meaning defined at sense 1a

Phrases Containing ocean

• a drop in the ocean
• inter-ocean
• mid-ocean ridge
• ocean perch
• ocean sunfish
• open ocean

Rhymes for ocean

• lotion
• notion
• potion
• commotion
• demotion
• devotion
• emotion
• laotian
• promotion
• locomotion

Kids Definition

ocean

noun

ˈō-shən 

1

: the whole body of salt water that covers nearly three fourths of the surface of the earth

2

: one of the large bodies of water into which the ocean is divided

oceanic

ˌō-shē-ˈan-ik

adjective