acidity acidity /əˈsɪdɪti/

noun

1. () The property of being acidic  ( sour , sourness , acidity )
   the property of being acidic
   
2. PH values below 7  ( acidity )
   pH values below 7
   
3. The taste experience when something acidic is taken into the mouth  ( acidity , acidulousness )
   the taste experience when something acidic is taken into the mouth