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

Soil pH The relative acidity or alkalinity of the soil affects how well roses can access nutrients in the soil. —Mary Marlowe Leverette, Southern Living, 6 Mar. 2026

Louis Latour’s 2024 Chassagne Montrachet has aromas of honeycomb, pineapple, and white flowers with bright acidity and flavors of vanilla, pear, and marzipan. —Mike Desimone, Robb Report, 5 Mar. 2026

Even with its bright look, scientists compare the water’s acidity to everyday liquids like vinegar or orange juice. —Munis Raza, Interesting Engineering, 4 Mar. 2026

The geyser has an acidic chemistry, but the acid is not concentrated, according to the USGS, which compared its water to having a similar acidity to orange juice or vinegar. —Julia Jacobo, ABC News, 3 Mar. 2026

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