Alkalinity

n. quality of a base, quality of having a pH level higher than 7 (Chemistry)

Alkalinity or AT is a measure of the ability of a solution to neutralize acids to the equivalence point of carbonate or bicarbonate. Alkalinity is closely related to the acid neutralizing capacity (ANC) of a solution and ANC is often incorrectly used to refer to alkalinity. However, the acid neutralizing capacity refers to the combination of the solution and solids present (e.g., suspended matter, or aquifer solids), and the contribution of solids can dominate the ANC (see carbonate minerals below).
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Noun
1. pH values above 7
(antonym) acidity
(hypernym) pH, pH scale

(n.)
The quality which constitutes an alkali; alkaline property.
  

noun
level of alkali in a body; hyperventilation causes fluctuating carbon dioxide levels in the blood, resulting in an increase of blood alkalinity