Source : Webster's Revised Unabridged Dictionary (1913)

Interact \In`ter*act"\, v. i.
   To act upon each other; as, two agents mutually interact.
   --Emerson. Tyndall.

Interact \In`ter*act"\, n. [Pref. inter- + act. Cf.
   {Entr'acte}.]
   A short act or piece between others, as in a play; an
   interlude; hence, intermediate employment or time.
   --Chesterfield.

Source : WordNet®

interact
     v : act together or towards others or with others; "He should
         interact more with his colleagues"