Headroom (noun)

The vertical space or clearance between the head and the ceiling, especially in a building, room, or vehicle.

Origin:

The term 'headroom' is derived from the idea of the space or room available above the head.

Examples:

1. The headroom in the attic was limited, making it difficult to stand upright.
2. The headroom in the car was more generous in the back seat than in the front.
3. She measured the headroom in the doorway to make sure the couch would fit.
4. The headroom in the elevator was just enough for him to stand comfortably.
5. The lack of headroom in the basement made it feel cramped and uncomfortable.