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

• commerce
• dealings
• intercourse
• relation

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

There’s also potential interactions with grapefruit juice and alcohol separately. —Bruce Y. Lee, Forbes, 29 Nov. 2024

The multiple layers of flashbacks are interwoven with scenes of the interview—of Leo’s fraught interactions with his three former students, and with his health aide, Rene (Caroline Dhavernas), and the interviewers’ assistant, Sloane (Penelope Mitchell). —Richard Brody, The New Yorker, 29 Nov. 2024

During the interaction, one officer tried to quiet the shouting officers. —Miguel Torres, Arizona Republic, 28 Nov. 2024

Your tips, taunts and daily interactions make our Grinchy hearts grow three sizes every day. —Isaac Avilucea, Axios, 27 Nov. 2024

Word History

First Known Use

1832, in the meaning defined above

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