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

But Mamdani's vision of a more affordable city, articulated through savvy social media videos and upbeat in-person interactions, has clearly resonated with young and first-time voters (even outside of New York). —Rachel Treisman, NPR, 5 Nov. 2025

Research shows eye contact is key to satisfying social interactions and activates social parts of the brain. —Matt Fuchs, Time, 4 Nov. 2025

Book a farm tour, which includes alpaca interaction and an opportunity to visit the farm store, which sells a variety of products made with alpaca fiber, or a pilates session with alpacas. —Jill Robbins, Southern Living, 4 Nov. 2025

Mars's interaction with the other planets serves up indecision instead of certainty. —Lisa Stardust, Refinery29, 4 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