- sourness, sour, acidity - the property of being acidic
--1 is a kind of taste property
--1 has particulars: acerbity, tartness; vinegariness, vinegarishness - acidity, acidulousness - the taste experience when something acidic is taken into the mouth
--2 is a kind of sour, sourness, tartness
- acidity - pH values below 7
--3 is a kind of pH, pH scale
Antonyms: alkalinity
--3 has particulars: hyperacidity