Post History
Your first step is to decide on the levels of division. What is a first level division, a second level division, etc.? Once you've done that, you need to decide what to call them. You have many opt...
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/45150 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/45150 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Your first step is to decide on the levels of division. What is a first level division, a second level division, etc.? Once you've done that, you need to decide what to call them. You have many options here, as other answers have shown. The “read in one sitting” sections should probably be called _chapters_. Chapter subdivisions probably don’t need to be named at all: you can have a fancy divider (this is traditional), or perhaps just a small gap between paragraphs, which seems to be more common these days. The larger sections, comprising a few chapters each, could reasonably be called _books_, _sections_, _parts_ or something else. (Actually, the words _section_ and _part_ are so flexible that they could also be applied to smaller bits, such as chapter subdivisions, if you did wish to name them.) Another option, which I have not seen covered in other answers, would be to pick a more whimsical naming scheme which matches your story. Are there any terms from your narrative that you could draw on in picking vocabulary. Many sci-fi works speak of a galaxy/universe divided into _sectors_. Your narrative parts take place in different areas, different _sectors_. Could you use the word _sector_ to name these divisions? Other examples will occur to you as you look over your narrative.