Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • 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.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the taste experience when something acidic is taken into the mouth
  • n. pH values below 7
  • n. the property of being acidic

Etymologies

From French acidité, from Latin aciditātem, accusative singular of aciditās ("sourness, acidity"), from acidus ("sour, acid"). See acid. (Wiktionary)

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