Acidity – Definition & Meaning

Acidity is a term used to describe the level of acidity or alkalinity in a substance. It is an important concept in chemistry and is used to describe the properties of many different substances, from food and drink to industrial chemicals.


Acidity is defined as the measure of the concentration of hydrogen ions (H+) in a solution. It is also described as the ability of a substance to donate protons or accept electrons. The pH scale is used to measure acidity, with a pH of 7 being neutral, a pH below 7 being acidic, and a pH above 7 being alkaline.


The term “acidity” comes from the Latin word “acidus,” which means sour. This is because many acidic substances, such as lemons and vinegar, have a sour taste.

Meaning in different dictionaries

In the Merriam-Webster dictionary, acidity is defined as “the quality, state, or degree of being acid.” The Oxford English Dictionary defines it as “the property of being acid or sour.” The Cambridge Dictionary describes it as “the quality of being acidic.”


Acidity is often associated with sourness, as many acidic substances have a sour taste. It is also associated with corrosion and damage, as acidic substances can eat away at materials over time.


Some synonyms for acidity include sourness, tartness, and acridity.


Antonyms for acidity include alkalinity, sweetness, and blandness.

The same root words

The root word for acidity is “acid,” which comes from the Latin word “acidus.” Other words with this root include acidify, acidosis, and acidulate.

Example Sentences

  • The acidity of the lemon juice made my mouth pucker.
  • The acidity of the soil made it difficult for plants to grow.
  • The acidity of the vinegar helped to break down the tough meat.
  • The acidity of the battery caused it to corrode over time.
  • The acidity of the wine gave it a crisp, refreshing taste.
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