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say it: hur-AHY-zuhn
horizon is a noun meaning "the line at which the sky and Earth appear to meet". It carries 4 recorded senses.
the line at which the sky and Earth appear to meet
the range of interest or activity that can be anticipated
“It is beyond the horizon of present knowledge”
a specific layer or stratum of soil or subsoil in a vertical cross section of land
the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for horizon come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.