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

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

Related Words for acidity

tartness, acerbity, pungency, sourness, causticity

Examples from the Web for acidity

Contemporary Examples of acidity

  • In this streamlined recipe, the salmon is half cooked on the grill and then half-“cooked” by the acidity of lime juice.

    The Daily Beast logo
    What to Eat

    July 28, 2009

Historical Examples of 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

acidity in Medicine




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.