headroom
/ˈhɛdrum/
noun
- The space between a person's head and the ceiling or top of a vehicle, doorway, or other structure.
- The van has plenty of headroom, even for tall passengers.
- Be careful walking into the basement; the headroom is only six feet.
- He hit his head on the low beam because there wasn't enough headroom.
- The amount of space or capacity available for growth, expansion, or additional activity.
- The project has some headroom in the schedule for unexpected delays.
- The company has enough headroom in its budget to hire new staff.
- This computer has headroom for extra memory if you need it later.