Television, TV
noun
テレビ comes from the English word television. It’s been shortened, which is really common with loanwords in Japanese. The "vi" sound becomes ビ, too. テレビ is sometimes written as "TV", but even then it’s usually pronounced テレビ.
今から、テレビでしゃべるんだ。
I'm going to speak on TV now.
えっ、テレビに出るの?
What, you're going on TV?
すぐにテレビをつけるよ!
I'll turn on the TV immediately!