A window can have multiple meanings depending on the context:

1. Architecture & Construction: A window is an opening in a wall, door, or roof that allows light and air to enter a building. It is usually covered with glass and can be opened or closed.

2. Computing (Microsoft Windows): Windows is an operating system developed by Microsoft that provides a graphical interface for users to interact with their computers. It is one of the most widely used operating systems in the world.

3. General Meaning: A window can also refer to a short period of time available for a particular activity, such as a "window of opportunity."

Which type of window are you interested in?