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Dictionary definition for: Horizon

1. (n) the line at which the sky and Earth appear to meet

2. (n) the range of interest or activity that can be anticipated; "It is beyond the horizon of present knowledge"

3. (n) a specific layer or stratum of soil or subsoil in a vertical cross section of land

4. (n) the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth

WordNet 2.1 Copyright Princeton University. All rights reserved.