HORIZON

noun Etymology: Middle English orizon, from Late Latin ~t-, ~, from Greek ~t-, horizōn, from present participle of horizein to bound, define, from horos boundary; perhaps akin to Latin urvum curved part of a plow Date: 14th century 1. the apparent junction of earth and sky, the great circle on the celestial sphere formed by the intersection of the celestial sphere with a plane tangent to the earth's surface at an observer's position, range of perception or experience, something that might be attained , 2. the geological deposit of a particular time usually identified by distinctive fossils, any of the reasonably distinct layers of soil or its underlying material in a vertical section of land, a cultural area or level of development indicated by separated groups of artifacts, ~al adjective