Longman Dictionary of Contemporary English homepage

interaction

noun
     
in‧ter‧ac‧tion W3 [uncountable and countable]
1 a process by which two or more things affect each other
interaction of
Price is determined through the interaction of demand and supply.
interaction with/between
the complex interaction between mind and body
2 the activity of talking to other people, working together with them etc
interaction with/between
the degree of interaction between teacher and student

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