optimum ( def 3 ).

1885–90; optim(um) + -al1

optimally, adverb
superoptimal, adjective
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World English Dictionary
optimal (ˈɒptɪməl)
another word for optimum

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"most favorable," 1890, from L. optimus (see optimum). Originally a word in biology.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

optimal definition

1. 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.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Wednesdays might be optimal because the middle of the week is a good time for a
  change of pace.
In other words, the optimal value is probably somewhere in the middle.
The value has to be based on the unique qualities of the invention and an
  optimal way of selling it.
In response many universities have squeezed operational and human resources to
  the point of optimal efficiency.
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