Source : Free On-Line Dictionary of Computing

radiosity
     
         A method for rendering a view of a
        three-dimensional scene that provides realistic lighting
        effects, such as interobject reflections and {color bleeding}.
        Radiosity methods are computationally intense, due to the use
        of linear systems of equations and the spatial complexity of
        large scenes.
     
        {Usenet} newsgroup: {news:comp.graphics}.
     
        [Is radiosity more accurate than {ray tracing}?  Does it take
        more computing power?  How does compute time scale with scene
        complexity?]
     
        (2003-06-01)