Acidity

//əˈsɪd.ɪ.ti// noun

noun ·Moderate ·High school level

Definitions

Noun
  1. 1
    The quality or state of being acid. countable, uncountable
  2. 2
    the property of being acidic wordnet
  3. 3
    Sourness; tartness; sharpness to the taste. countable, uncountable

    "the acidity of lemon juice"

  4. 4
    pH values below 7 wordnet
  5. 5
    Excessive acid quality, as in gastric secretions. countable, uncountable
Show 2 more definitions
  1. 6
    the taste experience when something acidic is taken into the mouth wordnet
  2. 7
    A caustic, sour, biting, or bitter quality. countable, figuratively, uncountable

    ""What shall we call it?" he asked. "Why should you not take the chance of perpetuating your own name?" said Summerlee, with his usual touch of acidity."

Synonyms

All synonyms
sournessacerbityacescencyacidacidnessacidulousness

Example

More examples

"Since primary school we've been checking for the qualities known as acidity and alkalinity with litmus paper."

Etymology

From French acidité, from Latin aciditātem, accusative singular of aciditās (“sourness, acidity”), from acidus (“sour, acid”). Equivalent to acid + -ity.

Related phrases

Hammett acidity functionacidity functionacidity regulatorburning liquidgeneral quality

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.