acidity

noun

acid·​i·​ty ə-ˈsi-də-tē 

a-

plural acidities

1

: the quality, state, or degree of being acid

2

: the state of being excessively acid

Synonyms

• bitterness
• bite
• edge

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

The acidity in vinegar helps to penetrate buildup to lift it off the surface of your cabinets. —Ashlyn Needham, Southern Living, 6 Sep. 2025

The balanced fruitiness and mild acidity cut through the richness, while a creamy, buttery mouthfeel provides richness and a mouth-coating texture. —Joseph V Micallef, Forbes.com, 3 Sep. 2025

Max Baum/Steffen Köhler To assess the changes wrought by the acidity, scientists measured the circumference of the teeth before and after incubation. —Melissa Fleur Afshar, MSNBC Newsweek, 27 Aug. 2025

The corvina ceviche is equally refreshing, perfectly balancing acidity and sweetness. —Miami Herald, 19 Aug. 2025

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

Rhymes for acidity

• aridity
• avidity
• cupidity
• fluidity
• humidity
• liquidity
• lucidity
• morbidity
• placidity
• rancidity
• rapidity
• rigidity

Kids Definition

acidity

noun

acid·​i·​ty ə-ˈsid-ət-ē 

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- 

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