The Collaborative International Dictionary of English v.0.48:
Window \Win"dow\, n. [OE. windowe, windoge, Icel. vindauga
window, properly, wind eye; akin to Dan. vindue. ????. See
Wind, n., and Eye.]
1. An opening in the wall of a building for the admission of
light and air, usually closed by casements or sashes
containing some transparent material, as glass, and
capable of being opened and shut at pleasure.
I leaped from the window of the citadel. --Shak.
Then to come, in spite of sorrow,
And at my window bid good morrow. --Milton.
2. (Arch.) The shutter, casement, sash with its fittings, or
other framework, which closes a window opening.
3. A figure formed of lines crossing each other. [R.]
Till he has windows on his bread and butter. --King.
4. a period of time in which some activity may be uniquely
possible, more easily accomplished, or more likely to
succeed; as, a launch window for a mission to Mars.
5. (Computers) a region on a computer display screen which
represents a separate computational process, controlled
more or less independently from the remaining part of the
screen, and having widely varying functions, from simply
displaying information to comprising a separate conceptual
screen in which output can be visualized, input can be
controlled, program dialogs may be accomplished, and a
program may be controlled independently of any other
processes occurring in the computer. The window may have a
fixed location and size, or (as in modern Graphical User
Interfaces) may have its size and location on the screen
under the control of the operator.
French window (Arch.), a casement window in two folds,
usually reaching to the floor; -- called also French
Window back (Arch.), the inside face of the low, and
usually thin, piece of wall between the window sill and
the floor below.
Window blind, a blind or shade for a window.
Window bole, part of a window closed by a shutter which can
be opened at will. [Scot.]
Window box, one of the hollows in the sides of a window
frame for the weights which counterbalance a lifting sash.
Window frame, the frame of a window which receives and
holds the sashes or casement.
Window glass, panes of glass for windows; the kind of glass
used in windows.
Window martin (Zool.), the common European martin. [Prov.
Window oyster (Zool.), a marine bivalve shell (Placuna
placenta) native of the East Indies and China. Its valves
are very broad, thin, and translucent, and are said to
have been used formerly in place of glass.
(a) (Arch.) See Pane, n., 3
(b) (Zool.) See Windowpane, in the Vocabulary.
Window sash, the sash, or light frame, in which panes of
glass are set for windows.
Window seat, a seat arranged in the recess of a window. See
Window stool, under Stool.
Window shade, a shade or blind for a window; usually, one
that is hung on a roller.
Window shell (Zool.), the window oyster.
Window shutter, a shutter or blind used to close or darken
Window sill (Arch.), the flat piece of wood, stone, or the
like, at the bottom of a window frame.
Window swallow (Zool.), the common European martin. [Prov.
Window tax, a tax or duty formerly levied on all windows,
or openings for light, above the number of eight in houses
standing in cities or towns. [Eng.]