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1 [usually in singular] the line at which the earth’s surface and the sky appear to meet:the sun rose above the horizon (also apparent or visible horizon) the circular boundary of the part of the earth’s surface visible from a particular point, ignoring irregularities and obstructions. (also celestial horizon) Astronomy a great circle of the celestial sphere, the plane of which passes through the center of the earth and is parallel to that of the apparent horizon of a place. 2
) the limit of a person’s mental perception, experience, or interest:she wanted to leave home and broaden her horizons
3 Geology a layer of soil or rock, or a set of strata, with particular characteristics. Archaeology a level of an excavated site representing a particular period.