interaction

noun

in·​ter·​ac·​tion ˌin-tər-ˈak-shən 

: mutual or reciprocal action or influence

interactional

ˌin-tər-ˈak-sh(ə-)nəl 

adjective

Synonyms of interaction

• relation
• intercourse
• dealings

Examples of interaction in a Sentence

she guessed from the friendly interaction that they were close to the other parents in the organization

Recent Examples on the Web

That single change turns the interaction into an actual negotiation about deliverables, scope and results. — Chris Ryan, Forbes.com, 30 July 2026

Every prompt, response, and autonomous agent interaction consumes tokens, and as AI systems become more sophisticated, usage can scale from thousands to millions—or even trillions—of tokens. — Sheryl Estrada, Fortune, 29 July 2026

Alas, although this interaction is pretty hilarious, our guy was edited out of the final product. — Madeleine Marr, Miami Herald, 29 July 2026

Republicans strongly criticized these measures, which continue to hang over Fauci in his latest interaction with federal lawmakers. — David Zimmermann, The Washington Examiner, 29 July 2026

Word History

First Known Use

1832, in the meaning defined above

Rhymes for interaction

• benefaction
• counteraction
• liquefaction
• putrefaction
• rarefaction
• satisfaction
• stupefaction
• tumefaction
• abstraction
• attraction
• compaction
• contraction

Kids Definition

interaction

noun

in·​ter·​ac·​tion ˌint-ə-ˈrak-shən 

: the action or influence of people, groups, or things on one another

interactional

-shnəl 

-shən-ᵊl

adjective

Medical Definition

interaction

noun

in·​ter·​ac·​tion ˌint-ə-ˈrak-shən 

: mutual or reciprocal action or influence

interaction of the heart and lungs

interactional

-shnəl, -shən-ᵊl 

adjective