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optimum

Flag: gbEnglishOxford English Thesaurus
optimum
adjective
the optimum pupil–teacher ratio:
best, most favourable, most advantageous, most appropriate, ideal, perfect, prime, optimal, model;
finest, superlative, peak, top, supreme, excellent, flawless, first-class;
informal tip-top, A1, stellar, top-notch.
optimum Oxford Dictionary of English