Entertaiment: The art of making people happy by providing them with amusement or pleasure. It may include literature, music, dance and theater performances, film and video games. It can also include sports, and various forms of visual arts such as museums and galleries.
-ment is a common suffix of Latin origin forming nouns, used with verb stems to form words denoting the result or product of the action of the verb (amazement, betterment, merriment). It is often replaced in English by -y.
Entertainment is a word that hits on the points our brains were evolved to deeply react to, like social backstabbing and murders. The word entertainment itself comes from the Medieval Latin intertenere, which combines the prefix inter- meaning “inside” and the suffix tenere, derived from the Indo-European root ten, meaning to stretch or expand.