from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An angle having a value equal to the area on a sphere subtended by a surface, divided by the square of the radius of that sphere. Solid angles are measured in steradians.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geometry The
three -dimensional analogof an angle, equivalent to the area of that portion of the surface a unit sphere that it subtends.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun an angle formed by three or more planes intersecting at a common point (the vertex)
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