noun, often attributive
win·​dow | \ˈwin-(ˌ)dō \

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

b : windowpane

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, -​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

When a One Direction door closes, Zayn Malik opens a rather large window — and then releases an album of 27 tracks. Lauren Rearick, Teen Vogue, "Zayn's New Album "Icarus Falls" Has 27 Songs," 29 Nov. 2018 Ma’ono hawks its popular chicken sandwiches at a counter window inside Rachel’s Ginger Beer on 12th Avenue. Tan Vinh, The Seattle Times, "From hot ramen to hotter hot pot: 30 restaurant openings in Seattle and on the Eastside," 28 Nov. 2018 The reality, though, is that Disney maintains this audience for a three-hour window. Kurt Wagner, Recode, "HQ Trivia was a blockbuster hit — but internal turmoil and a shrinking audience have pushed it to the brink," 5 Nov. 2018 Near a window, a table displays orbs—agate, quartz, malachite, marble—made by her father, a connoisseur of semiprecious stones. Nancy Hass, ELLE Decor, "A Milan Ceramicist Brings Her Family’s Artisanal Aesthetic to Life at Home," 4 Oct. 2018 The footage shows police breaking a window and pulling the woman out. Fox News, "Dramatic video shows police pulling woman from car sinking in Texas lake," 2 Oct. 2018 The photo is a window into the best friends' actual world — smiling, filled with sunshine, and of course, covered in SPF. Leah Prinzivalli, Allure, "Drew Barrymore Shares the Secret to Her Makeup-Free Selfie With BFF Cameron Diaz," 17 July 2018 An employee of a business in the 1300 block of Glenview Road told police July 3 that someone damaged a patio door window. Alexandra Kukulka,, "Blotter: 16-year-old without valid license left accident scene in Glenview," 13 July 2018 The woman called 911 just before 10:50 a.m. Her boyfriend had allegedly choked and punched her, and also slammed her head against a window inside a van, Schaler said. Teri Figueroa,, "Woman stabs alleged assailant, hides in brush with child until help comes," 13 July 2018

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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Statistics for window

Last Updated

5 Dec 2018

Look-up Popularity

Time Traveler for window

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

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More Definitions for window



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 \

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) \

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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More from Merriam-Webster on window

Spanish Central: Translation of window

Nglish: Translation of window for Spanish Speakers

Britannica English: Translation of window for Arabic Speakers Encyclopedia article about window

Comments on window

What made you want to look up window? Please tell us where you read or heard it (including the quote, if possible).


living or existing for a long time

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