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

Officers will sometimes use a felony that occurs during a traffic stop or enforcement interaction as cause to initiate a chase and utilize a PIT maneuver, but if the underlying reason for the interaction wasn’t a violent felony, the move likely shouldn’t be used, Taylor said. —Miami Herald, 28 Mar. 2026

The report detailed concerns about Caleb Elliott's hiring, including interactions involving his father, then-athletic director Bill Elliott, and school administrators. —Doug Myers, CBS News, 27 Mar. 2026

OpenAI acquired the open-source platform last month, just weeks after users flooded the internet with examples of interactions between the agents. —Rachyl Jones, semafor.com, 27 Mar. 2026

The next step is to better understand how such behavior emerges from simple physical interactions. —Neetika Walter, Interesting Engineering, 27 Mar. 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