Webster’s Revised Unabridged Dictionary · 1913
Interact
In′ter·act′ (ĭn′tẽr·ăkt′), 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.
In′ter·act′, v. i. To act upon each other; as, two agents mutually interact. Emerson. Tyndall.