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

Menon said CrSBr combines strong optical interactions with microwave-frequency magnetism in one crystal. — Aamir Khollam, Interesting Engineering, 18 Sep. 2026

Our interaction with Airbnb hosts was what set the tone of each destination. — Sara Sturek, Condé Nast Traveler, 18 Sep. 2026

This is not easy for Robin (Griffin), who, judging by his nervously twitching legs and tendency to info-dump on interlocutors, finds ordinary interactions very stressful. — Leslie Felperin, HollywoodReporter, 18 Sep. 2026

TikTok extended the show’s personality through candid interactions and interviews, contributing 51 percent of total Video Views. — Lisa Lockwood, Footwear News, 17 Sep. 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