The difference between Optimal and Optimum
When used as adjectives, optimal means the best, most favourable or desirable, especially under some restriction, whereas optimum means best or most advantageous.
Optimum is also noun with the meaning: the best or most favorable condition, or the greatest amount or degree possible under specific sets of comparable circumstances.
check bellow for the other definitions of Optimal and Optimum
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Optimal as an adjective:
The best, most favourable or desirable, especially under some restriction.
Examples:
"Finding the optimal balance between features and price is a common problem."
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Optimal as an adjective (artificial intelligence):
Describing a search algorithm that always returns the best result.
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Optimum as a noun:
The best or most favorable condition, or the greatest amount or degree possible under specific sets of comparable circumstances.
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Optimum as an adjective:
best or most advantageous; surpassing all others.