1. • noun - the line at which the sky and Earth appear to meet
   • noun - the range of interest or activity that can be anticipated
   • noun - a specific layer or stratum of soil or subsoil in a vertical cross section of land
   • noun - the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
2. • The apparent intersection of the earth and sky as seen by an observer.
   • Astronomy.
   • The sensible horizon.
   • The celestial horizon.
   • The limit of the theoretically possible universe.
   • The range of one’s knowledge, experience, or interest.
   • Geology.
   • A specific position in a stratigraphic column, such as the location of one or more fossils, that serves to identify the stratum with a particular period.
   • A specific layer of soil or subsoil in a vertical cross section of land.
3. • n - the line where the sky seems to meet the earth

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