Entertaiment is a word which has become highly idiomatic and has evolved to cover any activity that provides pleasure or diversion. It can be a private amusement for an individual, such as solving a crossword puzzle, to a social event or performance designed for a large group. Entertainment often has a sense of humor but may also have serious intent, as in the case of ceremonies or a religious festival. It is abbreviated entmt on fliers or in industry news publications when space is an issue.
Entertaiment hits on themes that the human brain was evolved to react deeply to, including backstabbing and murders.