from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Either of two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
from the GNU version of the Collaborative International Dictionary of English
- adj. an angle measured on a vertical circle, called an angle of elevation, or altitude, when reckoned from the horizon upward, and of depression when downward below the horizon.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. either of two equal and opposite angles formed by the intersection of two straight lines
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