interaction
nounUK /ˌɪntərˈækʃən/
US /ˌɪntərˈækʃən/
Interaction is when people or things do something together and affect each other.
The teacher watched the interaction between the two children as they shared the toys.
RELATED WORDS
OTHER MEANINGS
2. A chemical or physical process in which substances act on each other.
The interaction between the two chemicals caused the mixture to bubble.
3. The way a medicine works together with another medicine in the body.
The doctor checked for any interaction between the two drugs.
4. The way a computer program responds to what a user does.
The game's interaction is easy because you just tap the screen.