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

And within that galaxy, not only will stars live-and-die, and not only will star-formation cease once all of the gas has been consumed, but gravitational interactions will eject most of those stellar corpses, as well as the planet remnants that orbit them. —Big Think, 20 Feb. 2026

After one interaction, Judge Miranda instructed a defense attorney to change her tone. —Sofia Saric, Miami Herald, 20 Feb. 2026

During Kinuwan’s interaction with the ICE agent, a man nearby was being detained by several additional agents at the location. —Caroline Zimmerman, Kansas City Star, 20 Feb. 2026

The interaction quickly became a visual symbol of the deep rivalries in the AI industry, particularly between OpenAI and Anthropic, though Altman sought to brush off any deeper meaning. —Matt O'Brien, Fortune, 20 Feb. 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