a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air
"She wiped the rain from her bedroom window before opening it to let in some fresh morning air."
a transparent opening in a vehicle that allow vision out of the sides or back; usually is capable of being opened
"The passenger rolled down her window to catch some fresh air while driving through the city."
a transparent panel (as of an envelope) inserted in an otherwise opaque material
"The letter included a small window at the top so you could see his return address without opening it."
an opening that resembles a window in appearance or function
"he could see them through a window in the trees"
the time period that is considered best for starting or finishing something
"the expanded window will give us time to catch the thieves"
"they had a window of less than an hour when an attack would have succeeded"
an opening in a wall or screen that admits light and air and through which customers can be served
"he stuck his head in the window"
(computer science) a rectangular part of a computer screen that contains a display different from the rest of the screen
"After maximizing the document, I dragged the window to the side so I could see both my email and my spreadsheet at the same time."
An opening, usually covered by one or more panes of clear glass, to allow light and air from outside to enter a building or vehicle.
"She opened the window to let in some fresh air after being stuck inside all day."
In plain English: A window is an opening in a wall that lets light and air into a room.
"She opened the window to let some fresh air into the room."
Usage: Use "window" to refer specifically to the glazed aperture in a wall; do not confuse it with an open doorway when describing ventilation sources. It commonly collocates with phrases like "open the window," "look out of the window," and specific types such as "awning" or "sash."
To furnish with windows.
"The contractor promised to window the old garage before winter arrives."
In plain English: To window means to break a glass pane by hitting it with something hard.
"The company windowed its stock to protect shareholders from the sudden market crash."
The word "window" comes from Middle English and Old Norse, originally meaning "wind-eye" or a hole for wind to enter. It replaced the native Old English term for an eye-shaped opening in a wall.