To televise something is to show it on television. The key point is that the thing already exists on its own — a football match, a concert, a trial, the president's speech — and television carries it out to viewers. You televise an event; you do not televise a drama series that was made for TV in the first place. Because of that, the word turns up again and again with sport, ceremonies, funerals, debates and court cases. It is a slightly formal, newsy word: a sports fan would more likely say "Is the game on TV?" than "Is the game being televised?", though the second is perfectly normal in writing and in news reports. You will very often meet it in the passive — "the match will be televised live" — and as an adjective, "a televised debate", "live televised coverage".

電視轉播；在電視上播出