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

Together, these ingredients form a deep eutectic solvent, a liquid mixture whose components interact through forces such as hydrogen bonding and ion-dipole interactions. — Neetika Walter, Interesting Engineering, 31 Oct. 2026

The tone of these sorts of interactions has changed over the course of this season, as different people from different worlds have collided and been able to get past the impossibility of it. — Scott Tobias, Vulture, 30 Oct. 2026

Holmes and Evans invited Fielder and the film crew to stay with them for the 34 days before her imprisonment, and given the strangeness of their initial interactions, Fielder became a major on-camera presence in the film. — ArsTechnica, 30 Oct. 2026

Setting a firm boundary doesn’t have to turn an interaction into a confrontation. — Expert Panel®, Forbes.com, 30 Oct. 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