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'Hydration' may refer to:

★ 'Rehydration', the replenishment of water and electrolytes lost through dehydration

★ The biological absorption of water by plant tissues, often resulting in a shape change.

★ The organic 'Hydration reaction', a reaction in which water is added across a double bond

★ 'Mineral hydration', a reaction in which water is combined into the crystalline structure of a mineral