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

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Other Words from window

windowless \ ˈwin-​dō-​ləs How to pronounce windowless (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.
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Recent Examples on the Web Staff and administrative parking is directly in front of this window, so this was seen by a school leader. Christina Carrega, ABC News, "School officials launch an investigation into a Nazi flag hanging inside a classroom," 11 Feb. 2020 The meeting yielded an immediate victory: In the first vote under Masters, the Premier League approved a plan to align the closing of the summer transfer window with other top European leagues, an extension sought by the biggest clubs. New York Times, "The Long Search to Fill Soccer’s Biggest, Toughest Job," 9 Feb. 2020 Investigators learned shots were fired out of one of the apartment windows. Kaylee Remington, cleveland, "Police investigating after shots fired at Cleveland apartment in city’s Hough neighborhood," 8 Feb. 2020 The street-racing activity often included speeding, doing doughnuts, burning out tires, drag racing, not wearing seat belts, hanging out of car windows and blocking intersections, the department said at the time. Chelsea Curtis, azcentral, "Arizona lawmaker proposes bill to fine street racers, create 'drag racing prevention' fund," 7 Feb. 2020 Hall suggests that gazing out of a window could have similar effects, or taking a short walk outside of your building. Kristen Rogers, CNN, "Keeping a plant on your desk can reduce workplace stress, study says," 7 Feb. 2020 None of the administrative staff in the ministry speak English well enough to schedule appointments with an array of Western actors suddenly eager to seize this unlikely opening of a window for democracy. Rebecca Hamilton, Washington Post, "The Georgetown Student Who Became Justice Minister of Sudan," 5 Feb. 2020 His Sarasota high school was characteristically well-lighted and well-ventilated, with a broad corridor and generous banks of windows. Michael J. Lewis, WSJ, "An Education in Sarasota Styles," 25 Jan. 2020 That’s where Ariza learned that his little brother, Tajh, had fallen out of an open window in the family’s hotel room and plunged 30 floors down to his death. Jamie Goldberg, oregonlive, "Trevor Ariza ready for new opportunity with Portland Trail Blazers: ‘Every situation is a blessed situation when you’re playing at this level’," 23 Jan. 2020

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.

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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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Statistics for window

Last Updated

14 Feb 2020

Cite this Entry

“Window.” Dictionary, Merriam-Webster, Accessed 25 Feb. 2020.

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More Definitions for window


How to pronounce window (audio)

English Language Learners Definition of window

: an opening in a wall, door, etc., that usually contains a sheet of glass
: a sheet of glass that covers an opening in a building, vehicle, etc.
: a large window at the front of a store where goods are displayed so that they can be seen by people who are walking past


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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