What is Entertaiment?
Entertaiment is a noun that refers to performances such as plays and movies, or activities that give pleasure. It is also a form of play for children.
One story that illustrates the power of entertainment is the tale of Scheherazade, a character in Persian professional storytelling tradition. The tale has been retold in many different media: Rimsky-Korsakov and Ravel turned it into orchestral music; Pasolini made a film version; and Szymanowski and others wrote musical theatre adaptations.
You might see the word Entertainment abbreviated to entmt on a flier or in industry news publications, where space is limited. However, it is not commonly abbreviated in regular prose.