Englishfor English speakers
optimal
Adjective
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If something is optimal, it is at the most favourable condition.
Finding the optimal balance between features and price is a common problem.
region
Noun
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A region is an area of land or of the body.
The fishing problems have been happening only in the Atlantic coast region.
The southern regions of Japan are warm and tropical.
If we do an operation in this region of the brain, you may lose your ability to speak.
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A region is any connected part of a space or surface. This definition is useful in geometry.
In Euclidean space, a convex set is a region which has a geometric definition.