adjective [before noun] (ALSO optimal)
best; most likely to bring success or advantage:
A mixture of selected funds is an optimum choice for future security and return on investment.
optimize, UK USUALLY optimise Show phonetics
to make something as good as possible:
We need to optimize our use of the existing technology.
(from Cambridge Advanced Learner's Dictionary)
Quote from W. Edwards Deming:
Precise optimization is not necessary. It would be too costly.