n., pl. -ma (-mə) or -mums.

1. The point at which the condition, degree, or amount of something is the most favorable.
2. Biology. The most favorable condition for growth and reproduction.

adj.

Most favorable or advantageous; best.

[Latin, neuter sing. of optimus, best.]

adjective

Surpassing all others in quality: best, optimal, superlative, unsurpassed. See better/worse.

adj

Definition: best
Antonyms: least, poorest, worst

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IN BRIEF: The best amount of something.

They enjoyed the optimum conditions for blowing giant bubbles.

Dansk (Danish)
adj. - optimum, optimal
n. - optimum

Nederlands (Dutch)
optimaal, best mogelijke omstandigheden, het best haalbare compromis

Français (French)
adj. - optimum
n. - optimum

Deutsch (German)
n. - Optimum
adj. - optimal

Ελληνική (Greek)
n. - βέλτιστο, το καλύτερο δυνατό
adj. - βέλτιστος

Italiano (Italian)
ottimale

Português (Portuguese)
n. - condição mais favorável
adj. - ótimo

Русский (Russian)
оптимальный

Español (Spanish)
adj. - óptimo
n. - cantidad, grado, punto, etc. óptimos

Svenska (Swedish)
n. - optimum
adj. - optimal, optimum-

中文（简体） (Chinese (Simplified))
最适宜的, 最适宜

中文（繁體） (Chinese (Traditional))
adj. - 最適宜的
n. - 最適宜

한국어 (Korean)
adj. - 최적의
n. - 최적조건

日本語 (Japanese)
n. - 最適条件, 最適度
adj. - 最適の, 最高の

العربيه (Arabic)
‏(الاسم) الطريقه المثلى (صفه) الأقصى, الأفضل‏

עברית (Hebrew)
adj. - ‮מיטבי, הכי טוב, אופטימלי‬
n. - ‮המיטב, המצב הטוב ביותר, הפשרה האפשרית הטובה ביותר בין מגמות מתנגדות‬

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optimum nutrition	Optimum Nutrition Creatine 2500
Optimum Nutrition Pro Complex	Optimum Creatine 2500 Caps