R E F E R E N C E S
Horizon n [ME orizon, fr. LL horizont-, horizon, fr. Gk horizant-, horizón, fr. prp. of horizein to bound, define, fr. horos boundary; perh. akin to L urvum curved part of a plow] [14c] 1a: the apparent junction of earth and sky b: the great circle on the celestial sphere formed by the intersection of a plane tangent to the earth's surface at an observer's position with the celestial sphere c: range of perception or experience d: something that might be attained [new __s] 2a: the geological deposit of a particular time usu. identified by distinctive fossils b: any of the reasonably distinct layers of soil or its underyling material in a vertical section of land c: a cultural area or level of development indicated by separated groups of artifacts
[Merriam-Webster's Collegiate Dictionary, 10th Edition. Springfield, MA, USA: Merriam-Webster, Inc. 1995.]
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