1. the quality or state of being acid.
  2. sourness; tartness.
  3. excessive acid quality, as of the gastric juice.

noun plural -ties

  1. the quality or state of being acid
  2. the amount of acid present in a solution, often expressed in terms of pH
  3. another name for hyperacidity

1610s, from French acidité (26c.) or directly from Latin aciditatem (nominative aciditas), noun of quality from Latin acidus (see acid (adj.)).


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

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