- the quality or state of being acid.
- sourness; tartness.
- excessive acid quality, as of the gastric juice.
noun plural -ties
- the quality or state of being acid
- the amount of acid present in a solution, often expressed in terms of pH
- 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.)).
- The state, quality, or degree of being acid.