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

Golden State Warriors owner Joe Lacob’s short interaction with a fan via email has now gone viral after it was made public following a 136-131 loss to the Portland Trail Blazers on Sunday night. —Scott Thompson, FOXNews.com, 17 Dec. 2025

The light pulse produced a spin deflection up to ten times larger than in the material lacking that interaction. —Aamir Khollam, Interesting Engineering, 16 Dec. 2025

Check the label for vitamin K, iron, calcium, magnesium, and niacin—these are the biggest interaction culprits. —Sara Hoffman, Verywell Health, 16 Dec. 2025

The family interactions also inspired 17-year-old Randy Nazir, who has been showing up at the protests with his mom. —Miami Herald, 16 Dec. 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