acidity

Noun

1. The quality or state of being acid.
2. Sourness; tartness; sharpness to the taste.
   • the acidity of lemon juice
   • Empty stomachs lead to acidity and leave a sour taste in the mouth.
3. Excessive acid quality, as in gastric secretions.
4. A caustic, sour, biting, or bitter quality.
   • "What shall we call it?" he asked. "Why should you not take the chance of perpetuating your own name?" said Summerlee, with his usual touch of acidity. - 1912, Arthur Conan Doyle, The Lost World […], London; New York,...
   • It was a brave, good speech, a speech from that staunch and strong spirit which lay behind all the acidities and angularities of the old zoologist. - 1913, Arthur Conan Doyle, “The Time of Death”, in The Poison Belt...