• synonyms


noun Chemistry.
  1. alkaline condition; the quality that constitutes an alkali.
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Origin of alkalinity

First recorded in 1780–90; alkaline + -ity
Related formshy·per·al·ka·lin·i·ty, nounsu·per·al·ka·lin·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for alkalinity

Historical Examples

  • This is an application so light that a state of alkalinity cannot be long retained.

    Crops and Methods for Soil Improvement

    Alva Agee

  • They should show an alkalinity of approximately 0.5 per cent.

    Soap-Making Manual

    E. G. Thomssen

  • To avoid the formation of polyglycerols this alkalinity must not be exceeded.

    Soap-Making Manual

    E. G. Thomssen

  • An alternative method is to determine the alkalinity before and after the elimination of carbonate by chloride of barium.

  • The alkalinity of the blood seems not to be changed, although Chotin and Bouvier noticed a slight increase.

British Dictionary definitions for alkalinity


  1. the quality or state of being alkaline
  2. the amount of alkali or base in a solution, often expressed in terms of pH
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

alkalinity in Medicine


  1. The alkali concentration or alkaline quality of a substance that contains alkali.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.