basin

American  

[bey-suhn] / ˈbeɪ sən /

noun

basins plural

1. a circular container with a greater width than depth, becoming smaller toward the bottom, used chiefly to hold water or other liquid, especially for washing.

2. any container of similar shape, as the pan of a balance.

3. the quantity held by such a container.

   We need another basin of water to dilute the mixture.

4. a natural or artificial hollow place containing water.

5. a partially enclosed, sheltered area along a shore, often partly man-made or dredged to a greater depth, where boats may be moored.

   a yacht basin.

6. Geology. an area in which the strata dip from the margins toward a common center.

7. Physical Geography.

   1. a hollow or depression in the earth's surface, wholly or partly surrounded by higher land.

      river basin.

   2. drainage basin.

8. Botany. the depression in an apple, pear, or other pome at the end opposite the stem.

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basin British  

/ ˈbeɪsən /

noun

1. a round container open and wide at the top with sides sloping inwards towards the bottom or base, esp one in which liquids are mixed or stored

2. Also called: basinful.  the amount a basin will hold

3. a washbasin or sink

4. any partially enclosed or sheltered area where vessels may be moored or docked

5. the catchment area of a particular river and its tributaries or of a lake or sea

6. a depression in the earth's surface

7. geology a part of the earth's surface consisting of rock strata that slope down to a common centre

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basin Scientific  

/ bā′sĭn /

1. A region drained by a river and its tributaries.

2. A low-lying area on the Earth's surface in which thick layers of sediment have accumulated. Some basins are bowl-shaped while others are elongate. Basins form through tectonic processes, especially in fault-bordered intermontane areas or in areas where the Earth's crust has warped downwards. They are often a source of valuable oil.

3. An artificially enclosed area of a river or harbor designed so that the water level remains unaffected by tidal changes.

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Other Word Forms

Derived Forms

• subbasin
  noun
• basinal
  adjective
• basined
  adjective
• basinlike
  adjective
• interbasin
  adjective

Inflected Forms

Nouns

• basins
  plural

Etymology

Origin of basin

1175–1225; Middle English bacin < Old French < Late Latin bac ( c ) īnum ( bacc ( a ) water vessel, back ³ + -īnum -ine ¹ ); perhaps further related in Latin to beaker

Explanation

A basin is a container that holds water and is used for washing, but you probably just call it your bathroom sink. You can think of basinas something shaped like a bowl. If you're going for an old-fashioned ring, say "wash basin." If you’re in England, you might use a basin for cooking. The word basin also has various geological senses, particularly a depression in the ground or ocean floor. A basin is also the spot where a river drains — like the famed Mississippi River Basin. That’s one big bowl!

Example Sentences

Vince Moffitt, owner of Basin Health Companies in Farmington, N.M., says about 90% of his business, which includes home health, hospice, and caregiver services, is Medicaid focused.

From Barron's • Jun. 20, 2026

The findings gained additional significance when another deep earthquake struck on September 10, 2025, near Maeser in Utah's Uinta Basin.

From Science Daily • Jun. 3, 2026

“It’s not really whether industrial accidents are possible in the L.A. Basin — they are,” he said.

From Los Angeles Times • May 27, 2026

Since then, Nigeria has allowed hundreds of American troops to be posted to the country to train Nigerian forces and coordinate targeting of militant groups that have rampaged through the Lake Chad Basin for years.

From The Wall Street Journal • May 18, 2026

When her run is finished and she returns to the RV, now parked at—oh, God—Deadman’s Basin Reservoir, Montana, there is something on her bunk.

From "A Heart in a Body in the World" by Deb Caletti

Related Words

• bowl
• lagoon
• pan
• pool
• pot
• tub
• valley
• watershed