interaction noun [C, U] (THINGS) the way that two or more things combine and have an effect on each other

If you interact with someone — by talking, looking, sharing, or engaging in any kind of action that involves the two of you — you can be said to have had an interaction with that person.

Definition of interaction noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

in•ter•ac•tion, n. [uncountable] social interaction between men and women. [countable] day-to-day interactions. in•ter•ac•tive, adj.: Interactive video lets the user decide what to see on the screen.

INTERACTION definition: reciprocal action, effect, or influence. See examples of interaction used in a sentence.

Jan 20, 2026 · interaction (countable and uncountable, plural interactions) The situation or occurrence in which two or more objects or events act upon one another to produce a new effect; the effect …

Established in 1984, InterAction is the leading alliance of NGOs and partners in the United States. With a focus on serving the world’s impoverished and vulnerable populations, our organization fosters …

interaction definition: communication or direct involvement with someone or something. Check meanings, examples, usage tips, pronunciation, domains, and related words.

Interaction is a reciprocal action or influence that occurs between two or more objects, substances, people or systems, where each has an effect on the other. It could be in form of communication, …

A conversation or exchange between people. I enjoyed the interaction with a bunch of like-minded people.