Acidity/əˈsɪdəti/ Definition 1 of 4Pro Tip 1/3Test Soil Use 'acidity' to describe soil health for gardening or agriculture. The gardener adjusted the soil's acidity to grow blueberries. Pro Tip 2/3Taste Influence Mention 'acidity' when discussing how it affects the taste of food and drinks. The acidity in the wine balances its sweetness. Pro Tip 3/3Environmental Concern 'Acidity' can indicate environmental issues like acid rain effects. Scientists study lake acidity to monitor pollution levels.