Entertaiment means amusement, diversion, or enjoyment. It can be an activity that is a part of a festival, religious celebration, or a social event. It can also be a form of play that contributes to intellectual growth.
The term is often abbreviated as entmt, and you may see this on fliers or in industry news publications that focus on entertainment. It is possible that this abbreviation will become more common as the industry grows, as more businesses offer entertainment as a way to bring in revenue. Historically, entertainment has the ability to transcend various media, as demonstrated by how the story of Scheherazade has been retold in orchestral music by Rimsky-Korsakov, Ravel and Szymanowski; in film by Pasolini and others; and even in video games.