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 of acidity

• 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

To further safeguard your teeth from the acidity, sip it through a straw or rinse your mouth with water after ingesting it. —Julia Ries Wexler, Health, 7 Nov. 2025

Don’t use undiluted vinegar since its acidity can damage outer frames or other surfaces near the glass. —Karen Brewer Grossman, Southern Living, 5 Nov. 2025

Flavors of peach, citrus blossom, and guava are wrapped in a sheath of brilliant acidity. —Mike Desimone, Robb Report, 30 Oct. 2025

For the next 10 to 48 hours, the paste is gently stirred over very low heat, a step that cooks away any excess bitterness, acidity, and liquid. —Aleksandra Crapanzano, The Atlantic, 27 Oct. 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