This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The state, quality, or degree of being acid.

n. Hyperacidity.

n. The quality or state of being acid

n. The quality of sour; sourness; tartness; sharpness to the taste, as in the acidity of lemon juice.

n. Excessive acid quality, as in gastric secretions.

n. The quality of being sour; sourness; tartness; sharpness to the taste.

n. The quality of being acid or sour; sourness; tartness; sharpness to the taste.

n. the taste experience when something acidic is taken into the mouth

n. pH values below 7

n. the property of being acidic

"Taste again when the acidity is at a level you like."

alkalinity   

sour    tartness    sourness   

coefficient of acidity   

sourness    tartness   

fluidity    humidity    liquidity    morbidity    rapidity    rigidity    solidity    superfluidity    timidity    turbidity   

solubility    alkalinity    acerbity    humidity    moisture    flatulency    tartness    asperity    nucleophilicity    evaporation