Entertaiment is an interesting word because it hits on topics that the human brain was evolved to deeply react to – like social backstabbing and murder. This is why entertainment tends to be a bit of an adrenaline rush and why it can be so addictive.
Entertainment is often abbreviated as entmt. You may see this on a flier or in industry news publications where space is at a premium. It can also be found in short hand note taking or when the word is being used to describe an activity that has been shortened for clarity.
The most base form of entertainment is probably dog fighting, which involves pit bulls and other bred dogs to fight each other in arenas. But even this can be entertaining when it’s done for TV or on YouTube.