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

The episode picks up when Bret and Robert have their first tense interaction — their vaguely hostile and lightly homoerotic back-and-forth continues to be the highlight of the show for me. — Louis Peitzman, Vulture, 13 Aug. 2026

The property contains inland wetland resources, providing functions and values, including groundwater interaction, sediment retention, nutrient removal, wildlife habitat, flood storage, and ecological support, the motion says. — Staff Report, Hartford Courant, 13 Aug. 2026

Face-to-face interaction at school matters, but so do relationships built across cities and states. — Kavin Bendre, Chicago Tribune, 13 Aug. 2026

The electrical response could therefore be switched without substantially changing the material’s underlying magnetic interactions. — Neetika Walter, Interesting Engineering, 12 Aug. 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