Definition of Horizon

1. Noun. The line at which the sky and Earth appear to meet.

Exact synonyms: Apparent Horizon, Sensible Horizon, Skyline, Visible Horizon
Group relationships: Linear Perspective, Perspective
Generic synonyms: Line

2. Noun. The range of interest or activity that can be anticipated. "It is beyond the horizon of present knowledge"
Exact synonyms: Purview, View
Generic synonyms: Ambit, Compass, Orbit, Range, Reach, Scope

3. Noun. A specific layer or stratum of soil or subsoil in a vertical cross section of land.
Group relationships: Profile
Generic synonyms: Stratum
Specialized synonyms: Soil Horizon, Geological Horizon

4. Noun. The great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth.
Exact synonyms: Celestial Horizon
Generic synonyms: Great Circle

Definition of Horizon

1. n. The circle which bounds that part of the earth's surface visible to a spectator from a given point; the apparent junction of the earth and sky.

Definition of Horizon

1. Noun. The horizontal line that appears to separate the Earth from the sky. ¹

2. Noun. The range or limit of one's knowledge, experience or interest. ¹

3. Noun. (geology) A specific layer of soil or strata ¹

4. Noun. (archeology US) A cultural sub-period or level within a more encompassing time period. ¹

¹ Source:

Definition of Horizon

1. the line where the sky seems to meet the earth [n -S]

Medical Definition of Horizon

1. 1. The circle which bounds that part of the earth's surface visible to a spectator from a given point; the apparent junction of the earth and sky. "And when the morning sun shall raise his car Above the border of this horizon." (Shak) "All the horizon round Invested with bright rays." (Milton) 2. The unbroken line separating sky and water, as seen by an eye at a given elevation, no land being visible. 3. The epoch or time during which a deposit was made. "The strata all over the earth, which were formed at the same time, are said to belong to the same geological horizon." (Le Conte) 4. The chief horizontal line in a picture of any sort, which determines in the picture the height of the eye of the spectator; in an extended landscape, the representation of the natural horizon corresponds with this line. Apparent horizon. See Apparent. Artificial horizon, a level mirror, as the surface of mercury in a shallow vessel, or a plane reflector adjusted to the true level artificially; used chiefly with the sextant for observing the double altitude of a celestial body. Celestial horizon. See def. 2, above. Visible horizon. See definitions 1 and 2, above. Origin: F, fr. L. Horizon, fr. Gr. (sc) the bounding line, horizon, fr. To bound, fr. Boundary, limit. Source: Websters Dictionary (01 Mar 1998)

Horizon Pictures

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Lexicographical Neighbors of Horizon

hordeolum externum
hordeolum internum
hordeolum meibomianum
horizontal atrophy
horizontal bar
horizontal bars
horizontal beam film
horizontal cell
horizontal cell of Cajal
horizontal cells of retina
horizontal combination

Literary usage of Horizon

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Principles and Practice of Surveying by Charles Blaney Breed, George Leonard Hosmer (1908)
"To Make the horizon Glass Perpendicular to the Plane of the Sextant. — With the sextant held in a horizontal plane, sight on a distant horizontal line such ..."

2. The Sacred Books of China: The Texts of Confucianism by James Legge (1899)
"G, just touches the horizon curve, when it will be seen that a Serpentis and Antares are then culminating, Regulus and 3 Centauri are just setting, ..."

3. Astronomy by Simon Newcomb, Edward Singleton Holden (1883)
"We have seen that the altitude of the pole above the horizon of any observer changes as the observer ... Z is the zenith of the place, and HR its horizon. ..."

4. Manual of Astronomy: A Text-book by Charles Augustus Young (1902)
"CHAPTER III CORRECTIONS TO ASTRONOMICAL OBSERVATIONS l)ip of the horizon ... Dip of the horizon In observations of the altitude of a heavenly body at sea, ..."

5. Proceedings by Royal Geographical Society (Great Britain), Norton Shaw, Francis Galton, William Spottiswoode, Clements Robert Markham, Henry Walter Bates, John Scott Keltie (1872)
"Mercurial horizon. — Altitudes taken by its means are thoroughly reliable only ... A very ingenious, small, and handy mercurial horizon has been contributed ..."

6. The Sun by Amédée Guillemin (1875)
"What is the Form of the Solar Disc Ï—The Sun at the horizon ; ita Doubly Elliptic Form ; Fantastic Forms caused by Refraction in Layers of Vapor. ..."

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