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 acidity of lemon juice, and its vitamin C, also help your body absorb green tea’s antioxidants. —Jenna Anderson, Health, 18 Dec. 2025

Try Lemon Juice Just like white vinegar, lemon juice has an acidity that can get rid of dullness affecting your whites. —Quincy Bulin, Southern Living, 17 Dec. 2025

These waters exhibit higher acidity and elevated levels of toxic metals, which can contaminate fish habitat and drinking water and impact subsistence livelihoods. —Matthew L. Druckenmiller, The Conversation, 16 Dec. 2025

Researchers have observed higher acidity and a greater concentration of toxic metals in these rusting streams. —Evan Bush, NBC news, 16 Dec. 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