1. The property of being acidic
   "The acidity of the vinegar";
   - sourness
    
2. PH values below 7
   "The high acidity of the soil made it unsuitable for many crops"
    
3. The taste experience when something acidic is taken into the mouth
   "The acidity of the lemon made her pucker her lips";
   - acidulousness

Derived forms: acidities

Type of: pH, pH scale, sour, sourness, tartness, taste property

Antonym: alkalinity

Encyclopedia: Acidity