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

How do awards play into these political interactions? —Fiction Non Fiction, Literary Hub, 8 Jan. 2026

Standing 165 centimeters tall and weighing 71 kilograms, the GR-3 offers 55 degrees of freedom and is equipped with tactile sensors distributed across its body for responsive interaction. —Kaif Shaikh, Interesting Engineering, 8 Jan. 2026

Her main problem was with the MAGA movement in general, believing that her negative interactions with MAGA protesters reflected the hearts and minds of the movement more broadly. —Brady Knox, The Washington Examiner, 7 Jan. 2026

Grapefruit can cause issues for some people because of its interactions with certain medications. —Health, 7 Jan. 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