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

The higher the acidity (pH less than six), the bluer your blooms, while more alkaline soil (pH greater than seven) typically results in pinkish flowers. —Patricia Shannon, Southern Living, 9 May 2026

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

Just be sure to avoid using vinegar on natural stone surfaces, as the acidity can cause damage. —Kate Van Pelt, The Spruce, 1 May 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