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

That’s the beauty of wine from a region known for its duality; with ideal balance of soft tannins and fresh acidity, Alto Adige Pinot Nero offers lovers of the grape a world of choices. —Mike Desimone, Robb Report, 24 May 2026

When spiders produce silk, the glands in their abdomen alter water content, control acidity, align proteins, and effectively reorganize molecular bonds. —Christopher McFadden, Interesting Engineering, 23 May 2026

As acidity rises during fermentation, these proteins stop floating freely and begin linking together into a microscopic network that traps water, fat and nutrients. —Samantha Agate, Miami Herald, 23 May 2026

The vinegar’s acidity could damage or dull the finish on a black faucet over time. —Daley Quinn, Southern Living, 23 May 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