1. The line at which the sky and Earth appear to meet
   "The ship disappeared beyond the visible horizon";
   - apparent horizon, visible horizon, sensible horizon, skyline
    
2. The range of interest or activity that can be anticipated
   "It is beyond the horizon of present knowledge";
   - view, purview
    
3. The great circle on the celestial sphere whose plane passes through the sensible horizon and the centre of the Earth
   "Astronomers use the celestial horizon as a reference for measuring celestial coordinates";
   - celestial horizon
    
4. A specific layer or stratum of soil or subsoil in a vertical cross section of land
   "The archaeologists carefully excavated each horizon of the ancient site"

Derived forms: horizons

Type of: ambit, compass, great circle, line, orbit, range, reach, scope, stratum

Part of: perspective, profile

Encyclopedia: Horizon, Saskatchewan