If the list has an implicit request for quality ranking between the answers or a grading of the answers, the different items should each be their own answer and voted on separately. Such as resources for specific purposes. (Since the changes in the usage of CW posts, though, this type of question would probably be asked as a normal question and switch over to wiki if it was requested or when it hit >30 answers, assuming it wasn't closed first.)
If the list is a collection of facts, particularly facts that have an order(i.e. alphabetized or chronological), it should be in one answer so that order can be maintained. For example the badge descriptions and recent feature changes wikis on MSO. They will split out to sub-answers as the text gets too long for a single post, such as when the badges post was split into A-L and M-Z. Then links to each sub-answer can be added to the question body.
I'd say that the terminology wiki probably should have one answer which is alphabetized. Though, we could have one answer for generic terminology and a separate answer for acronyms and then split out a separate answer for each of the the major systems (D&D specific terms, GURPS, etc.) into their own answers. (See the other answers in the badge descriptions: badge families and tag badges.)
Also, I'd think we want to keep the definitions as short as possible, leaving the long winded expositions to other sites which we could link to for further information. (i.e. this is not an encyclopedic entry with a complete historical definition and etymology, it's a here's enough so you can at least understand the answer to your question kind of entry.)