Article on Entertaiment:
Entertainment has developed a unique quality to cross over different media and adapt itself to the scale of the audience, from a private entertainment for an individual; to a meal adapted for two; to a party; to a performance for a large public. This flexibility has given the familiar forms of entertainment a life span that is almost unlimited.
It is not uncommon to see the word entertainment abbreviated as entmt on a flier or in industry news publications, but it’s not common outside these contexts. Entertaiment is a broad concept and it is possible that many entertainments have a serious purpose, such as in the various styles of ceremony, celebration, religious festival or satire for example.