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

• acerbity
• acidness
• acridity
• acridness
• acrimoniousness
• acrimony
• acuteness
• asperity
• bite
• bitterness
• edge
• harshness
• keenness
• poignance
• poignancy
• pungency
• roughness
• sharpness
• tartness

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 fruity notes were a perfect foil for the fresh, crunchy vegetables and savory cod, with the wine’s texture and acidity providing a refreshing finish to each bite. —Liz Thach, Forbes.com, 25 June 2025

Widespread in the Trapani region as well as throughout Agrigento and Palermo, Grillo is an aromatic white that has terrific acidity and excellent structure. —Mike Desimone, Robb Report, 23 June 2025

Vinegar Mix equal parts white vinegar with water for a naturally effective solution against carpet beetles, thanks to the acidity. —Kaitlyn Yarborough, Southern Living, 22 June 2025

These foods are low in fiber, acidity, and are not spicy.5 Your response to food can be individual. —Merve Ceylan, Health, 21 June 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