horizon meaning and definition

HORIZON noun

Definition of horizon (noun)

1. the line at which the sky and Earth appear to meet
   • synonyms: apparent horizon, sensible horizon, skyline, visible horizon
2. the range of interest or activity that can be anticipated
   • "It is beyond the horizon of present knowledge"
   • synonyms: purview, view
3. a specific layer or stratum of soil or subsoil in a vertical cross section of land
4. the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
   • synonyms: celestial horizon