1. a window that opens on hinges at the side
2. the frame of a window or door
Usage: architectural

Examples

• She opened the casement to let in the fresh air.
• The old house had beautiful wooden casement windows.
• He painted the casement frame white to match the trim.
• The casement swung outward on its brass hinges.
• Rain was beating against the casement during the storm.
• The carpenter repaired the damaged casement.
• Ivy grew around the stone casement of the cottage window.