1. The property of being directional or maintaining a direction
   "the directionality of written English is from left to right"
    
2. The property of a microphone or antenna of being more sensitive in one direction than in another
   "The directionality of the microphone helped reduce background noise";
   - directivity

Derived forms: directionalities

Type of: radial asymmetry, spatial property, spatiality

Encyclopedia: Directionality