noun, often attributive
win·​dow | \ ˈwin-(ˌ)dō How to pronounce window (audio) \

Definition of window

1a : an opening especially in the wall of a building for admission of light and air that is usually closed by casements or sashes containing transparent material (such as glass) and capable of being opened and shut
c : a space behind a window of a retail store containing displayed merchandise
d : an opening in a partition or wall through which business is conducted a bank teller's window
2 : a means of entrance or access especially : a means of obtaining information a window on history
3 : an opening (such as a shutter, slot, or valve) that resembles or suggests a window
4 : the transparent panel or opening of a window envelope
5 : the framework (such as a shutter or sash with its fittings) that closes a window opening
7 : a range of wavelengths in the electromagnetic spectrum to which a planet's atmosphere is transparent
8a : an interval of time within which a rocket or spacecraft must be launched to accomplish a particular mission
b : an interval of time during which certain conditions or an opportunity exists a window of vulnerability
9 : an area at the limits of the earth's sensible atmosphere through which a spacecraft must pass for successful reentry
10 : any of various rectangular boxes appearing on a computer screen that display files or program output, that can usually be moved and resized, and that facilitate multitasking
out the window
: out of existence, use, or consideration

Other Words from window

windowless \ ˈwin-​dō-​ləs How to pronounce window (audio) , -​də-​ \ adjective

Examples of window in a Sentence

She opened a window to let in some air. I looked out the window and saw a deer. He used vinegar and water to wash the windows. He accidentally broke a window. Can you roll down the car window? The windows along 5th Avenue were all decorated for Christmas. I saw a beautiful dress in the window. He sits behind a window and sells movie tickets. Make sure the address shows through the window in the envelope. A window opened in the fog and we could finally see the ocean. See More
Recent Examples on the Web Smokers should never flick their cigarettes out the window as the filters are made of plastic, as are the tips of cigars, Bartolotta said. Peter Krouse, cleveland, 7 Aug. 2022 Hankison had been standing outside the apartment and is accused of blindly firing through a door and a window. Theresa Waldrop, CNN, 4 Aug. 2022 After pulling them over, officers used their intercom system to order Armstead, who was driving, to throw the keys out the window, exit the car and get on her knees with her hands up, according to the suit. Michael Murney, Chron, 4 Aug. 2022 The incentive to try new things and bring new ideas to the table goes out the window. Todd Juneau, Forbes, 3 Aug. 2022 Seventeen backpackers and three people evacuated from their home near Yreka stayed at the American Red Cross disaster shelter in Ashland on Monday, Aug. 1, watching a nighttime display of lightning out the window. oregonlive, 3 Aug. 2022 Once the door or window is closed, the sensors make contact and can be armed. Kat De Naoum, Better Homes & Gardens, 29 July 2022 Be sure door and window screens are tight fitting and in good repair. Hartford Courant, 27 July 2022 This excess water is then disposed of by simply dumping out the reservoir, or some models use a drain system or pump to expel the water into a sink, drain, or out the window. Paige Szmodis, Popular Mechanics, 27 July 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'window.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of window

13th century, in the meaning defined at sense 1a

History and Etymology for window

Middle English windowe, from Old Norse vindauga, from vindr wind (akin to Old English wind) + auga eye; akin to Old English ēage eye — more at eye

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Time Traveler for window

Time Traveler

The first known use of window was in the 13th century

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Dictionary Entries Near window



window back

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Last Updated

11 Aug 2022

Cite this Entry

“Window.” Dictionary, Merriam-Webster, Accessed 15 Aug. 2022.

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More Definitions for window


win·​dow | \ ˈwin-dō How to pronounce window (audio) \

Kids Definition of window

1 : an opening in a wall to let in light and air
2 : the glass and frame that fill a window opening
3 : any of the areas into which a computer display may be divided and on which different types of information may be shown

Other Words from window

windowless adjective a windowless room


win·​dow | \ ˈwin-(ˌ)dō, -də(-w) How to pronounce window (audio) \

Medical Definition of window

2 : a small surgically created opening : fenestra sense 2a
3 : a usually narrow interval of time or range of values for which a certain condition or an opportunity exists coma and multiorgan failure can occur within hours and there may be a very narrow window of opportunity for transplantation— J. P. A. Lodge — see therapeutic window


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