Window/ˈwɪndəʊ/ Definition 1 of 5Pro Tip 1/2Visual Access Used to describe the ability to see through or out of something. He admired the skyline through the restaurant's large window. Pro Tip 2/2Actionable Item It often indicates that an action (like opening or closing) can be performed with it. He rushed to close the window as the rain started pouring in.