Entertaiment is a good way to get the brain to realease seratonin, dopamine and other chemicals that make you feel good. Entertainment also tends to hit on the things that people were evolved to react deeply to, like backstabbing, murder and other social machinations that were critical to human survival and understanding of the world we live in. It is common to see the word entertainment abbreviated as entmt on fliers, or in industry news publications where space is limited.
Something affording pleasure, diversion, or amusement: The new restaurant is a source of great entertainment for the whole family.