Definition: optimal

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Source: WordNet (r) 1.7 

optimal
     adj : most desirable possible under a restriction expressed or
           implied; "an optimum return on capital"; "optimal
           concentration of a drug" [syn: optimum]

Source: The Free On-line Dictionary of Computing (2003-OCT-10) 

optimal

   1. <mathematics> Describes a solution to a problem which
   minimises some cost function.  Linear programming is one
   technique used to discover the optimal solution to certain
   problems.

   2.  Of code: best or most efficient in time,
   space or code size.

   (1995-10-05)