Entertaiment is an agreement to occupy the mind agreeably and divert it with something pleasurable or amusing. It can also be a hospitable provision for the wants and needs of others.
The word is derived from the medieval Latin intertenere and the Indo-European root ten, both meaning to hold inside. The prefix inter indicates that it is an activity understood objectively. It encompasses communication between text and audience from an external stimulus, offers pleasure, requires an audience to exist and occurs in a passive form. It can also hit on points the brain was evolved to deeply react to, such as murders and social backstabbing.