onscreen adjective 1adverb 1 adjective1 •As seen on a screen (as of television, film, or computer) rather than in real life.The two actors had a very realistic onscreen romance, but in reality they couldn't stand each other. adverb1 •Inside the frame of the cinema, television or computer screen.I leaned over her shoulder to see two cybergirls yanking out each other's hair. Katy was typing insults that appeared onscreen. — 2006