Acidity is sourness, so you might turn down a bite of your friend's kumquat because its acidity is just too much for you.

This noun is good for literal acidity, like a lemon's sour flavor or, in scientific terms, the chemical quality of a substance that reacts with a base to make salt. You can also use it in a figurative way when someone's tone is sharp and biting: "The acidity in my dad's voice told me we were really in trouble for eating all the tomatoes in his garden."

Definitions of acidity
  1. noun
    the property of being acidic
    synonyms: sour, sourness
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    acerbity, tartness
    a sharp sour taste
    vinegariness, vinegarishness
    a sourness resembling that of vinegar
    type of:
    taste property
    a property appreciated via the sense of taste
  2. noun
    pH values below 7
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    pH values above 7
    excessive acidity
    type of:
    pH, pH scale
    (from potential of Hydrogen) the logarithm of the reciprocal of hydrogen-ion concentration in gram atoms per liter; provides a measure on a scale from 0 to 14 of the acidity or alkalinity of a solution (where 7 is neutral and greater than 7 is more basic and less than 7 is more acidic);
  3. noun
    the taste experience when something acidic is taken into the mouth
    synonyms: acidulousness
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    type of:
    sour, sourness, tartness
    the taste experience when vinegar or lemon juice is taken into the mouth
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