acidity

[uh-sid-i-tee]
noun
1.
the quality or state of being acid.
2.
sourness; tartness.
3.
excessive acid quality, as of the gastric juice.

Origin:
1610–20; < Late Latin aciditās. See acid, -ity

nonacidity, noun
overacidity, noun
preacidity, noun
superacidity, noun
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World English Dictionary
acidity (əˈsɪdɪtɪ)
 
n , pl -ties
1.  the quality or state of being acid
2.  the amount of acid present in a solution, often expressed in terms of pH
3.  another name for hyperacidity

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

acidity a·cid·i·ty (ə-sĭd'ĭ-tē)
n.
The state, quality, or degree of being acid.

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
To prevent acidity of the stomach, add from one to two teaspoonfuls of lime
  water to each half-pint of milk.
The acidity is so strong that it kills fish and aquatic vegetation.
Buttermilk's slight acidity helps activate baking soda and make bread rise.
As long as this increase goes on the longer it will take to reach a new
  equilibrium heat and acidity balance.
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