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horizon (n.)

late 14c., orisoun, from Old French orizon (14c., Modern French horizon), earlier orizonte (13c.), from Latin horizontem (nominative horizon), from Greek horizon (kyklos) "bounding (circle)," from horizein "bound, limit, divide, separate," from horos "boundary, landmark, marking stones." The h- was restored in English 17c. in imitation of Latin. Old English used eaggemearc ("eye-mark") for "limit of view, horizon." The apparent horizon is distinguished from the celestial or astronomical horizon.

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Definitions of horizon from WordNet

horizon (n.)
the line at which the sky and Earth appear to meet;
Synonyms: apparent horizon / visible horizon / sensible horizon / skyline
horizon (n.)
the range of interest or activity that can be anticipated;
It is beyond the horizon of present knowledge
Synonyms: view / purview
horizon (n.)
a specific layer or stratum of soil or subsoil in a vertical cross section of land;
horizon (n.)
the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth;
Synonyms: celestial horizon
From wordnet.princeton.edu