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

Yet on the table in front of us were three vials of blue liquid with a pH of 4—roughly the acidity of coffee or orange juice. —Shayla Love, New Yorker, 8 Aug. 2025

The dijon mustard sauce is also a limited edition item, and PEOPLE recommends using a generous amount of it as its acidity cuts through the rich flavor of the fried chicken. —Logan Holland, People.com, 7 Aug. 2025

The corvina ceviche is equally refreshing, perfectly balancing acidity and sweetness. —Constance Ogle, Miami Herald, 1 Aug. 2025

Its more robust character is balanced by tangy acidity, which perfectly complements its red berry fruit. —Joseph V Micallef, Forbes.com, 30 July 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