Also found in: Thesaurus, Legal, Encyclopedia, Wikipedia.
1. Acting or capable of acting on each other.
2. Computers Of or relating to a program that responds to user activity.
3. Of, relating to, or being a form of television entertainment in which the signal activates electronic apparatus in the viewer's home or the viewer uses the apparatus to affect events on the screen, or both.
(Computer Science) computing with direct communication between a user and a machine