acidity

noun

acid·​i·​ty ə-ˈsi-də-tē How to pronounce acidity (audio)
a-
plural acidities
Synonyms of aciditynext
1
: the quality, state, or degree of being acid
2
: the state of being excessively acid

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Its acidity effectively breaks down grease, eliminates mold, neutralizes odors, and dissolves mineral deposits. Mary Cornetta, Better Homes & Gardens, 4 Jan. 2026 Traditionally, farmers have added these living biofertilizers to soil, where acidity – plus the rival microbes who live there – pose a great threat, and thus for every amount of biofertilizers dumped into soil, only a portion gets to the roots. New Atlas, 4 Jan. 2026 Archery Summit 2023 Chardonnay has aromas of Anjou pear, citrus blossom, and mandarin zest with balanced acidity and flavors of honeydew and cantaloup melons, candied orange peel, and brown baking spices. Mike Desimone, Robb Report, 2 Jan. 2026 The dish beautifully balances richness from the meats, sweetness from onions and bell peppers, and bright acidity from the cherry peppers and wine. Jasmine Smith, Southern Living, 2 Jan. 2026 See All Example Sentences for acidity

Word History

Etymology

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

First Known Use

1615, in the meaning defined at sense 1

Time Traveler
The first known use of acidity was in 1615

Cite this Entry

“Acidity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acidity. Accessed 8 Jan. 2026.

Kids Definition

acidity

noun
acid·​i·​ty ə-ˈsid-ət-ē How to pronounce acidity (audio)
a-
plural acidities
1
: the quality, state, or degree of being acid
2
: the state of being extremely acid

Medical Definition

acidity

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

More from Merriam-Webster on acidity

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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