You can live without knowing these words, but when wading through highfalutin writing/conversations about theater you will be glad to have them in your verbal armory.
However, if you can define all these words already, there is no reason for you to bother with this list. But just in case you have gotten a bit rusty, below are the words. Can you define them? If you can’t, you might need to take this crash course!
Here is the list: Dénouement, Deus ex machina, Entr’acte, Ingénue, Mise-en-scène, Ouvre, Proscenium, Soliloquy