1. Vertical space available to allow easy passage under something
   "The low headroom in the basement made it difficult to stand upright";
   - headway, clearance
    
2. The capacity of a system to reproduce loud sounds without distortion
   "The amplifier's high dynamic headroom allowed it to handle sudden peaks in volume";
   - dynamic headroom
    
3. The capacity for growth, improvement, or expansion
   "The company has significant headroom in its market to expand and increase profits"

Derived forms: headrooms

Type of: elbow room, hi-fi, high fidelity, room, way

Encyclopedia: Headroom