Meaning

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

originInherited from Middle English orisonte, orisoun, from Middle French horizon, horizonte, from Old French orisonte, orison, via Latin horizōn, from Ancient Greek ὁρίζων (horízōn), from ὅρος (hóros, “boundary”).

Etymology from Wiktionary, CC BY-SA 3.0