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 team now points to interactions between manganese and ytterbium as a possible source of the unusual Hall response. — Aamir Khollam, Interesting Engineering, 3 Oct. 2026

Authorities tracked Wood through the IP address used during the interaction, which led them to an apartment in Denton. — Bonny Chu, FOXNews.com, 2 Oct. 2026

Sheriff’s officials encouraged parents or guardians whose children received music lessons from Chen to speak with their children about their interactions with their music teacher. — Rosalio Ahumada, Sacbee.com, 2 Oct. 2026

And there will always be gay kids coming to terms with their nascent sexuality — like Clive’s 16-year-old son George (Jackson Connor), whose interactions with Leo draw his father’s suspicion and ire. — Alison Herman, Variety, 2 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