interaction

noun

1. (countable, uncountable)The situation or occurrence in which two or more objects or events act upon one another to produce an effect; the effect resulting from such a situation or occurrence.

   “Be aware of interactions between different medications.”

   “Such technologies will also “shape future human interaction with the machines we created,” he added.”

   “At the beginning of September South Western Railway withdrew its Class 442 EMUs from service due to a safety issue concerning interaction with lineside signals.”

2. (countable, uncountable)A conversation or exchange between people.

   “I enjoyed the interaction with a bunch of like-minded people.”

   “Another 'basic' is staff interaction with customers - and here, ScotRail excelled. Every single one of them whom RAIL engaged with was polite and chatty, and some were even humorous!”