verb (used without object)
to act one upon another.

1740–50; inter- + act Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To interact
World English Dictionary
interact (ˌɪntərˈækt)
(intr) to act on or in close relation with each other

Interact (ˈɪntərˌækt)
(Canadian) a system of electronic bank payments or withdrawals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The robot can communicate and interact with humans, and has even learned how to
  make facial expressions in response to an emotion.
The software must interact with humans on their own terms, and fast.
The professors do not actually interact with the students.
Exactly how the two drugs interact to produce this result is not yet clear.
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