Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun The quality or state of being acid
  • noun The quality of sour; sourness; tartness; sharpness to the taste, as in the acidity of lemon juice.
  • noun pathology Excessive acid quality, as in gastric secretions.

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

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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