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WordBand 6.5–8Academic (NAWL)
optimum
/ˈɒptɪməm/
adjective1 of 2
the best or most desirable
noun2 of 2
The best or most favorable condition, or the greatest amount or degree possible under specific sets of comparable circumstances.
Source: New Academic Word List (Browne, Culligan & Phillips) (CC BY-SA 4.0); Wiktionary (CC BY-SA 3.0)