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

What was once a routine part of preventive care has become a fraught interaction — and the implications extend well beyond animal health. —Henry I. Miller, Boston Herald, 25 Nov. 2025

While pageant organizers seemed unable to escape drama in the weeks leading up to the actual event, Miss Ireland Aadya Srivastava tells PEOPLE that almost all interactions between contestants were peaceful and friendly. —Zoey Lyttle, PEOPLE, 25 Nov. 2025

The interaction turned physical, DHS claims, and Huerta was briefly hospitalized as a result. —Austin Turner, CBS News, 25 Nov. 2025

In fact, the showrunners found Barrera and Daniel’s interactions so intriguing that scenes were rewritten to bring the two women face-to-face. —Patrick Gomez, Entertainment Weekly, 25 Nov. 2025

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