Meaning of “interaction” - Learner’s Dictionary

interaction

noun [ C, U ] uk us /ˌɪntərˈækʃən/
PEOPLE

the activity of talking and doing things with other people, or the way you do this:

Our work involves a lot of interaction with the customers.
THINGS

the way that two or more things combine and have an effect on each other

(Definition of “interaction” from the Cambridge Learner’s Dictionary © Cambridge University Press)