noun, often attributive \ˈwin-(ˌ)dō\

: 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

Full Definition of WINDOW

a :  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 (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>
:  a means of entrance or access; especially :  a means of obtaining information <a window on history>
:  an opening (as a shutter, slot, or valve) that resembles or suggests a window
:  the transparent panel or opening of a window envelope
:  the framework (as a shutter or sash with its fittings) that closes a window opening
:  chaff 4
:  a range of wavelengths in the electromagnetic spectrum to which a planet's atmosphere is transparent
a :  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>
:  an area at the limits of the earth's sensible atmosphere through which a spacecraft must pass for successful reentry
:  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
win·dow·less \-dō-ləs, -də-\ adjective
out the window
:  out of existence, use, or consideration

Examples of WINDOW

  1. She opened a window to let in some air.
  2. I looked out the window and saw a deer.
  3. He used vinegar and water to wash the windows.
  4. He accidentally broke a window.
  5. Can you roll down the car window?
  6. The windows along 5th Avenue were all decorated for Christmas.
  7. I saw a beautiful dress in the window.
  8. He sits behind a window and sells movie tickets.
  9. Make sure the address shows through the window in the envelope.
  10. A window opened in the fog and we could finally see the ocean.

Origin of 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
First Known Use: 13th century

Other Building Terms

batten, cistern, hearth, lath, transom, wainscot


noun \ˈwin-(ˌ)dō, -də(-w)\   (Medical Dictionary)

Medical Definition of WINDOW

: a small surgically created opening : fenestra 2a
: 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


noun    (Concise Encyclopedia)

Opening in the wall of a building for light and air, and sometimes for framing a view. Since early times, the openings have been filled with stone, wooden, or iron grilles, with panes of glass or other translucent material such as mica or, in East Asia, paper. A window in a vertically sliding frame is called a sash window: a single-hung sash has only one half that moves; in a double-hung sash, both parts slide. A casement window swings open on hinges attached to the upright side of the frame. Awning windows swing outward on hinges attached to the top of the frame; hopper windows swing inward on hinges attached to the bottom of the frame. Large, fixed (nonoperating) areas of glass are commonly called picture windows. A bay window (see oriel) is an exterior projection of a bay of a building that also forms an interior recess, providing better light and view than would a window flush with the building line. See also Diocletian window; rose window; shoji.


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