Definition of "hydration" []

• The incorporation of water molecules into a complex with those of another compound (noun)
• The process of providing an adequate amount of water to body tissues (noun)
• The chemical reaction by which a substance (such as cement) combines with water, giving off heat to form a crystalline structure in its setting and hardening. (noun)

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• "She was very sick at both ends and needed hydration from the vet."
• "The new time trial bike also incorporates a built-in hydration system that allows"
• "I am told something I’d never considered: in desert countries most of one’s hydration is lost at the back of the neck, which can quickly lead to heat stroke, so a headscarf that wraps around the neck is essential to block this loss."