Other forms: livestreams
A livestream is a broadcast watched over the internet as it happens. Watch the livestream, start a livestream, livestream the concert.
There is always a delay of some seconds while the video is packaged and sent, which is why a livestream and a television broadcast of the same event never quite line up. Chat alongside it is what makes it different from television. Note that the compound is live plus stream and is recent.
1nounlivestreamA broadcast watched over the internet as it happens.
“Thousands of fans watched the concert on a livestream from their homes.”
livestream is a broadcast.
Also accepted in games: stream, live stream
Live plus stream, formed in the internet era from the sense of streaming data.
From live + stream.
Etymology from Wiktionary, CC BY-SA