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optimum adjective
/ˈɒp.tɪ.məm/
/ˈɑːp-/ adj [before noun] (also optimal) Definition
best; most likely to bring success or advantage
A mixture of selected funds is an optimum choice for future security and return on investment.
(Definition of optimum adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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