noun. The apparent intersection of the earth and sky as seen by an observer.

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noun. The limit or edge of the observable universe.

noun. The range of one's knowledge, experience, or interest.

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noun. A specific position in a column of rock layers, usually designated by the occurrence of one or more distinctive fossils or by a distinctive sediment bed, that is used in stratigraphy.

noun. A layer of soil that can be distinguished from adjacent layers of soil and that is characterized by a certain color, texture, structure or chemical composition.

noun. A period during which the influence of a specified culture spread rapidly over a defined area.

To limit or bound by a horizon.

noun. The circle which at sea forms the apparent boundary between sea and sky, and on land would bound the sky were all terrestrial obstructions down to the sea-level removed. Called the apparent, sensible, or visible horizon, in distinction from the astronomical horizon (which see, below).

noun. Hence The line that bounds the view; the limit of vision.

noun. Figuratively, the limit of intellectual perception, of experience, or of knowledge.

noun. In geology, a stratum or group of strata characterized by the presence of a particular fossil not found in the underlying or overlying beds, or of a peculiar assemblage of fossils.

noun. In zoology and anatomy, a level or horizontal line or surface: as, the horizon of the teeth; the horizon of the diaphragm

noun. The line 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.

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noun. A plane passing through the eye of the spectator and at right angles to the vertical at a given place; a plane tangent to the earth's surface at that place; called distinctively the sensible horizon.

noun. A plane parallel to the sensible horizon of a place, and passing through the earth's center; -- called also rational horizon or celestial horizon.

noun. The unbroken line separating sky and water, as seen by an eye at a given elevation, no land being visible.

noun. The epoch or time during which a deposit was made.

noun. 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.

noun. The limit of a person's range of perception, capabilities, or experience.

noun. A boundary point or line, or a time point, beyond which new knowledge or experiences may be found.

noun. See under Apparent.

noun. 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.

noun. See def. 2, above.

noun. the vertical angle between the sensible horizon and a line to the visible horizon, the latter always being below the former.

noun. See def. 2, above.

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noun. See definitions 1 and 2, above.

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

noun. The range or limit of one's knowledge, experience or interest.

noun. A specific layer of soil or strata

noun. A cultural sub-period or level within a more encompassing time period.

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

noun. the line at which the sky and Earth appear to meet

noun. the range of interest or activity that can be anticipated

"Also looming on the horizon is the question of a referendum and its timing."

apparent horizon  artificial horizon  astronomical horizon  axis of the horizon  celestial horizon  

sensible horizon  

ambit  compass  great circle  line  orbit  

mizen  wizen  

background  boundary  cliff  cloud  darkness  

azimuth  background  circle  clear sight  color vision  

celestial horizon  rational horizon