1. The valence or combining power of an acid, or the number of replaceable atoms of hydrogen in its molecule. 2. The characteristic(s) of being a chemical base.
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ba·sic·i·ty (bə-sisґĭ-te) 1. the quality of being a base, or basic. 2. the combining power of an acid; it is measured by the number of hydrogen atoms replaceable by a base.Medical dictionary. 2011.