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.


Next Word in the Dictionary: window back
Previous Word in the Dictionary: windore
All Words Near: window

Seen & Heard

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

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More