window

American  

[win-doh] / ˈwɪn doʊ /

noun

• windows
  plural

1. an opening in the wall of a building, the side of a vehicle, etc., for the admission of air or light, or both, commonly fitted with a frame in which are set movable sashes containing panes of glass.

2. such an opening with the frame, sashes, and panes of glass, or any other device, by which it is closed.

3. the frame, sashes, and panes of glass, or the like, intended to fit such an opening.

   Finally the builders put in the windows.

4. a windowpane.

5. anything likened to a window in appearance or function, as a transparent section in an envelope, displaying the address.

6. a period of time regarded as highly favorable for initiating or completing something.

   Investors have a window of perhaps six months before interest rates rise.

7. Military. chaff.

8. Geology. fenster.

9. Pharmacology. the drug dosage range that results in a therapeutic effect, a lower dose being insufficient and a higher dose being toxic.

10. Aerospace.

    1. launch window.

    2. a specific area at the outer limits of the earth's atmosphere through which a spacecraft must reenter to arrive safely at its planned destination.

11. Computers. a section of a display screen that can be created for viewing information from another part of a file or from another file.

    The split screen feature enables a user to create two or more windows.

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verb (used with object)

1. to furnish with a window or windows.

2. Obsolete. to display or put in a window.

window British  

/ ˈwɪndəʊ /

noun

1. a light framework, made of timber, metal, or plastic, that contains glass or glazed opening frames and is placed in a wall or roof to let in light or air or to see through

2. an opening in the wall or roof of a building that is provided to let in light or air or to see through

3. See windowpane

4. the display space in and directly behind a shop window

   the dress in the window

5. any opening or structure resembling a window in function or appearance, such as the transparent area of an envelope revealing an address within

6. an opportunity to see or understand something usually unseen

   a window on the workings of Parliament

7. a period of unbooked time in a diary, schedule, etc

8. short for launch window weather window

9. physics a region of the spectrum in which a medium transmits electromagnetic radiation See also radio window

10. computing an area of a VDU display that may be manipulated separately from the rest of the display area; typically different files can be displayed simultaneously in different overlapping windows

11. (modifier) of or relating to a window or windows

    a window ledge

12. informal dispensed with; disregarded

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verb

1. (tr) to furnish with or as if with windows

window Idioms  

1. see out the window.

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Other Word Forms

Derived Forms

• unwindowed
  adjective
• well-windowed
  adjective
• windowless
  adjective
• windowy
  adjective

Inflected Forms

Nouns

• windows
  plural

Etymology

Origin of window

1175–1225; Middle English windoge, windowe < Old Norse vindauga, equivalent to vindr wind ¹ + auga eye

Explanation

A window is an opening in a wall that you can see through. Most windows are fitted with glass and can be opened to let air flow through them on a warm spring day. Buildings have windows so that the sun can brighten up indoor spaces during the day. You can also use window to mean just the glass pane inside the frame: "Sorry that my baseball broke the window!" Cars have windows too, which can be rolled up and down, and department stores use their large windows to display items for sale. And on a computer, a window is an area containing information that's enclosed by a window-like "frame."

Example Sentences

See Examples For:

window windows

The DJ was silhouetted by a large window display of a gigantic, human-sized plastic re-creation of Raising Cane’s chicken tenders and crinkle-cut fries being dipped into a tub of Cane’s Sauce.

From Slate ● Aug. 24, 2026

"Let's see what the last couple weeks of the transfer window brings and then let's go for it."

From BBC ● Aug. 23, 2026

"That tells us the damage is not irreversible, and that there may be a window for intervention even after disease processes have been triggered."

From Science Daily ● Aug. 23, 2026

As orders flood into the restaurant via online food delivery services and a walk-up window, a butcher slices through whole chickens while one cook flips thin slabs of steak and chicken on a grill.

From Los Angeles Times ● Aug. 22, 2026

I gazed hungrily out the window, holding onto Haarlem with my eyes.

From "The Hiding Place" by Corrie ten Boom

Companies offered to attach warning labels near the handles for free, and some said they would remotely upgrade software involving lowering windows after a crash.

From Barron's ● Aug. 24, 2026

Chinese regulators have pushed back on screen-only controls for certain safety-related vehicle functions, such as windows and doors.

From The Wall Street Journal ● Aug. 22, 2026

For those in homes which are not built to the Passivhaus standard, Baeli offers one simple piece of advice - shade your windows.

From BBC ● Aug. 21, 2026

Davis urged residents to take steps to reduce their risk such as using DEET-containing insect repellent, eliminating sources of standing water and ensuring windows and doors have tight-fitting screens.

From Los Angeles Times ● Aug. 21, 2026

Spills of light from windows and streetlamps lit my way.

From "The Red Car to Hollywood" by Jennie Liu