n. 1 best, finest, most favourable, ideal, perfection, model, paragon, exemplar In all work, the optimum is difficult to achieve
adj. 2 best, finest, most favourable, ideal, perfect, choicest, optimal, first-rate, first-class, sterling, prime, capital, excellent, exceptional, superlative, extraordinary, unique, peerless, unequalled, unexcelled, unsurpassed These instruments keep the chamber at the optimum temperature After months of training, Guy is in optimum condition to win the marathon.