A1
a space usually filled with glass in the wall of a building or in a vehicle, to allow light and air in and to allow people inside the building to see out
Dictionary examples:
The cat jumped through the window. (0.0)
A pizza flew through the window. (0.0)
I saw a funny face in window. (0.0)
I saw a child's face at the window. (13.0)
She has some wonderful plants in the window. (13.1)
Is it all right if I open/close the window? (14.2)
He caught me staring out of the window. (30.0)