Interaction
1: Noun
A mutual or reciprocal action or influence.Example sentence: The interaction between the two chemicals caused a reaction.
2: Noun
Communication or direct involvement with someone or something.Example sentence: Human interaction is a crucial part of social life.
3: Noun
In physics, a particular way of particles influencing one another.Example sentence: The study of electromagnetic interaction is a part of quantum mechanics.
Fun Fact:
The term 'interaction' originally comes from Latin 'interactio', from 'inter' meaning 'between' and 'agere' meaning 'to do' or 'to act'.