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adj. 1. Consisting of, relating to, or being in water: an aquatic environment. 2. Living solely or chiefly in or on the water: aquatic animals and plants. 3. Taking place in or on the water: an aquatic sport. n. 1. An organism that lives solely or chiefly in or on the water. 2. aquatics Sports Athletic activities performed in or on the water. [Middle English aquatique, from Old French, from Latin aquāticus, from aqua, water; see akw-ā- in the Appendix of Indo-European roots.] a·quati·cal·ly adv. |
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