While watching Alien[sup]3[/sup] last night, I thought about how ‘quadrilogy’ isn’t a word. A set of four dramatic or literary works is a tetralogy. A three-member set is a trilogy. But what’s a two-member set? ‘Bilogy’ isn’t a word.
Also, it’s pretty useless to have a word for a single film. In writing, it’s called a monograph. Is there a word for a single film?
Well, since we’re looking at Greek and not Latin roots, the word would be something like “duology.” A quick Google search of “duology trilogy quadralogy” seems to indicate it does exist, albeit rare.
I was under the impression that a monograph is a piece of writing (generally a scholarly paper) written by a single author, not one for which there was no sequel.