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

Get the azaleas off to a good start by having soil acidity tested, and adjusting the pH if needed, following test recommendations. —Tom MacCubbin, The Orlando Sentinel, 2 May 2026

Due to the lower acidity, yellow tomatoes often have a milder taste than red tomatoes, but Lillian’s Yellow Heirloom scores high in the rich, assertive taste category. —Nadia Hassani, The Spruce, 1 May 2026

This easy-to-whip-up buttermilk cake unabashedly leans into the acidity and creaminess of whole buttermilk to flavor and build the base of the batter. —Kaitlyn Yarborough, Southern Living, 30 Apr. 2026

Frosting doesn’t have to be so sweet Introducing an element of acidity can do wonders in taming frosting’s inherent sweetness. —Shilpa Uskokovic, Bon Appetit Magazine, 28 Apr. 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