It is common for those who write fantasy or futuristic science fiction to make up words. You don’t always need to define those words either. If it is clear from the context what that word means, then readers will accept it happily — this is particularly the case with swear words. If you are using full sentences of a made-up, or foreign, language, you will need to put in a definition somewhere. Some put in a glossary in the back, however, that only works for printed books and even then could frustrate your reader. It is best to have the translation within close proximity of the foreign passage.
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