- total a. (a) an obsolete expression of gastric a., the a. being determined by titration with sodium hydroxide, using phenolphthalein as indicator.
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1) the quality, state, or degree of being sour or chemically acid <the \acidity of lemon juice>
2) the quality or state of being excessively or abnormally acid: HYPERACIDITY
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acid·i·ty (ə-sidґĭ-te) [L. aciditas] the quality of being acid or sour; containing acid (hydrogen ions).Medical dictionary. 2011.