Yesterday I asked whether we should burninate the fiction tag on the Main site here. In that post and the comments I mentioned that I think the science tag would already be enough to show that a question is about science-fiction, as I think that every question on this site is dedicated to creating fiction and a question focused on science is thereby automatically a question relating to what I would call science-fiction.
But apparently there are different opinion on this matter, two of which I will try to postulate. This is especially difficult because there are apparently quite a lot of Definitions of science-fiction:
According to Wikipedia science-fiction deals with imaginative concepts such as futuristic science. This includes things like time-travel, faster-than-light-travel and extraterrestrial life. The tag science-fiction should be used for fictional science elements related to the future.
Science-Fiction deals with imaginative concepts. The term is often related to futuristic concepts, such as time-travel and faster-than-light-travel, but not limited to a certain time. For example steampunk can be seen as a subgenre of science-fiction. The tag science-fiction should be used for fictional science elements in your specific world and time.
This post should be a list of possible tag wikis that include a more elaborate statement than the ones I provided. The wiki should include the reasoning for why a certain definition was used. If you feel that your reasoning shouldn't be included in the real wiki please make sure that it is obvious which parts are your meta discussion about the tag and which parts are the tag wiki you propose.
Upvotes on the answers to this question should indicate which tag wiki you prefer so that we can find a fitting definition. Please add other wiki drafts if you feel that the existing answers do not fit the definition that you think we should use on WorldBuilding or suggest edits by editing or commenting on existing drafts if you feel like one of them is already pretty close to what you have in mind.