extreme

mastery
UK /ɪkˈstɹiːm/ US /ɪkˈstɹim/adjnounadv

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Which meaning of 'extreme' best matches its use in the sentence?

An extreme version of vorticity is a vortex. The vortex is a spinning, cyclonic mass of fluid, which can be observed in the rotation of water going down a drain, as well as in smoke rings, tornados and hurricanes.