Water/ˈwɔːtər/ Definition 1 of 8Pro Tip 1/3Common Beverage Water is universally known as an essential drink for hydration and health. Could I have a glass of water, please? Pro Tip 2/3Natural Occurrences Water refers to any natural body of water, such as seas, lakes, and rivers. They went swimming in the lake's clear waters. Pro Tip 3/3Universal Solvent Water is often mentioned in scientific contexts as it dissolves many substances. We added salt until it dissolved in water.