acid·​i·​ty | \ ə-ˈsi-də-tē How to pronounce acidity (audio) , a- \
plural acidities

Definition of acidity

1 : the quality, state, or degree of being acid
2 : the state of being excessively acid

Keep scrolling for more

Examples of acidity in a Sentence

detected a certain acidity in the way he responded the acidity of their relationship was well known to their mutual acquaintances
Recent Examples on the Web Crocs use these ISOs to detect the movements of prey around them as well as to gauge the temperature and acidity of the water. John Pickrell, National Geographic, "This small dinosaur had a marvelous sense of touch, detailed fossils reveal," 5 Oct. 2020 Even cooler, by adding nitrogen or nitrous oxide to your caffeinated beverage, your drink will taste better, have less acidity, and stay fresh much longer. Stack Commerce, Popular Science, "Celebrate National Coffee Day with these highly caffeinated deals," 1 Oct. 2020 Lighter limes, on the other hand, have a softer acidity and are more fragrant. Behzad Jamshidi, Bon Appétit, "There's Nothing Quite Like the Musky, Sour Aroma of a Dried Lime," 28 Sep. 2020 But this caricature of Fitzgerald as frivolous and unfailingly rhapsodic obscures the bracing acidity of his satire and the cool eye of his intelligence. Sarah Churchwell, The New York Review of Books, "The Oracle of Our Unease," 22 Sep. 2020 The combo — delivering zippy acidity, bright strawberry fruit and a slight herbal note on the finish — works well. Washington Post, "Get cozy with a $15 California cab that begs for roasted chicken," 25 Sep. 2020 While bacteria levels have mostly improved over the past decade, other water quality indicators, like acidity and dissolved oxygen levels, haven’t changed significantly in the harbor and its tributaries since 2013. Christine Condon,, "Baltimore’s Waterfront Partnership releases new vision for Inner Harbor swimming," 23 Sep. 2020 One of the biggest challenges aquarists now face is getting the temperature, acidity, oxygen and light levels just right. New York Times, "Bringing the Ocean’s Midnight Zone Into the Light," 22 Sep. 2020 Expect rounder wines with less of that typical zingy acidity. Elin Mccoy, Fortune, "Wildfires, trade wars, COVID-19: The 2020 global wine harvest may go down as the most challenging yet," 20 Sep. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'acidity.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of acidity

1615, in the meaning defined at sense 1

History and Etymology for acidity

borrowed from French & Late Latin; French acidité, going back to Middle French, borrowed from Late Latin aciditāt-, aciditās, from Latin acidus "sour, acid entry 2" + -itāt-, -itās -ity

Keep scrolling for more

Learn More about acidity

Time Traveler for acidity

Time Traveler

The first known use of acidity was in 1615

See more words from the same year

Statistics for acidity

Last Updated

10 Oct 2020

Cite this Entry

“Acidity.” Dictionary, Merriam-Webster, Accessed 21 Oct. 2020.

Keep scrolling for more

More Definitions for acidity


acid·​i·​ty | \ ə-ˈsi-də-tē How to pronounce acidity (audio) \
plural acidities

Kids Definition of acidity

: the quality, state, or degree of being acid


acid·​i·​ty | \ ə-ˈsid-ət-ē, a- How to pronounce acidity (audio) \
plural acidities

Medical Definition of acidity

1 : the quality, state, or degree of being sour or chemically acid the acidity of lemon juice
2 : the quality or state of being excessively or abnormally acid : hyperacidity

Keep scrolling for more

Comments on acidity

What made you want to look up acidity? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!