interaction

/ˌɪntəɹˈækʃən/

• phonetics
• /ˌɪntəɹˈækʃən/ 

• noun
• The situation or occurrence in which two or more objects or events act upon one another to produce a new effect; the effect resulting from such a situation or occurrence.
  Be aware of interactions between different medications.
• A conversation or exchange between people.
  I enjoyed the interaction with a bunch of like-minded people.