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noun - The apparent intersection of the earth and sky as seen by an observer. Also called apparent horizon.

noun - Astronomy The sensible horizon.

noun - Astronomy The celestial horizon.

noun - Astronomy The limit of the theoretically possible universe.

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

noun - Geology A specific position in a stratigraphic column, such as the location of one or more fossils, that serves to identify the stratum with a particular period.

noun - Geology A specific layer of soil or subsoil in a vertical cross section of land.

noun - Archaeology A period during which the influence of a specified culture spread rapidly over a defined area: artifacts associated with the Olmec horizon in Mesoamerica.

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