the quality or state of being acid.
sourness; tartness.
excessive acid quality, as of the gastric juice.

Nearby words

  1. acidic,
  2. acidified serum test,
  3. acidify,
  4. acidimeter,
  5. acidimetry,
  6. acidize,
  7. acidly,
  8. acidogenic,
  9. acidolysis,
  10. acidometer

Origin of acidity

From the Late Latin word aciditās, dating back to 1610–20. See acid, -ity

Related formsnon·a·cid·i·ty, nouno·ver·a·cid·i·ty, nounpre·a·cid·i·ty, nounsu·per·a·cid·i·ty, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for acidity

British Dictionary definitions for acidity


noun plural -ties

the quality or state of being acid
the amount of acid present in a solution, often expressed in terms of pH
another name for hyperacidity
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

Word Origin and History for acidity



1610s, from French acidité (26c.) or directly from Latin aciditatem (nominative aciditas), noun of quality from Latin acidus (see acid (adj.)).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for acidity




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.