Aerate/ˈereɪt/ Definition 1 of 3Pro Tip 1/3Aquatic Life Aerating is crucial for fish tanks to supply oxygen to fish. He installed a pump to aerate the aquarium. Pro Tip 2/3Refresh Wine Aerating wine means letting it breathe to enhance flavor. She decanted the wine to aerate it before serving. Pro Tip 3/3Lawn Care Aerate your lawn to improve water and nutrient uptake. In spring, people often aerate their lawns for better grass growth.