Entertaiment is a broad term that encompasses a variety of activities. It can be as simple as a person choosing their own entertainment from a wide selection of pre-recorded options, or as complex as an orchestrated performance for thousands. It can be as escapist as watching a violent action movie, or as socially relevant as reading the daily crossword puzzle, or as thought provoking as a political speech or satire.
Sometimes the word is abbreviated to entmt. This is most often seen on fliers or in industry news publications when space is limited. However, it is rare for this to be done in general conversation.