noun Chemistry.
alkaline condition; the quality that constitutes an alkali.

1780–90; alkaline + -ity

hyperalkalinity, noun
superalkalinity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
alkalinity (ˌælkəˈlɪnɪtɪ)
1.  the quality or state of being alkaline
2.  the amount of alkali or base in a solution, often expressed in terms of pH

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

alkalinity al·ka·lin·i·ty (āl'kə-lĭn'ĭ-tē)
The alkali concentration or alkaline quality of a substance that contains alkali.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The basic chemistry required for their existence becomes too difficult at low
  levels of ocean alkalinity.
Concrete's high alkalinity inhibits the oxidation of the reinforcing steel.
Control the acidity and alkalinity and provide leavening.
Ponds with acidic bottom soils that are filled with poorly mineralized water
  characteristically have low alkalinity and hardness.
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