Casement
/ˈkeɪsmənt/
Definition 1 of 1
Pro Tip 1/3Architectural Term
Casement is often used in architecture to describe a certain style of window. 
The old Victorian house had classic casement windows that added to its charm.
Pro Tip 2/3Hinged Opening
Remember that a casement opens on hinges, which distinguishes it from windows that slide or lift. 
Unlike the sliding windows in my kitchen, my bedroom window is a casement.
Pro Tip 3/3Side Hinges
Casements usually have their hinges at the side, but sometimes can have top or bottom hinges. 
The top-hinged casements are also known as awning windows.