Etymology
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acidity (n.)

"quality of being acid or sour; tartness," 1610s, from French acidité (16c.) or directly from Latin aciditatem (nominative aciditas) "sourness," noun of quality from Latin acidus "sour, tart" (see acid (adj.)).

updated on September 14, 2022

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Definitions of acidity from WordNet

acidity (n.)
the property of being acidic;
Synonyms: sourness / sour
acidity (n.)
the taste experience when something acidic is taken into the mouth;
Synonyms: acidulousness
acidity (n.)
pH values below 7;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.