Dehydration/ˌdiːhaɪˈdreɪʃn/ Definition 1 of 3Pro Tip 1/3Human Health Emphasizes the health implications and potential dangers of not having enough water. She was hospitalized for severe dehydration after the marathon. Pro Tip 2/3Preventable Condition Suggests that dehydration can often be avoided with proper care. Carrying a water bottle on hot days helps prevent dehydration. Pro Tip 3/3Urgency Indicates a situation that requires quick action to correct. During the heatwave, dehydration became a pressing concern.