The dedative case (also referred to as respective) is a grammatical case invented by J. R. R. Tolkien in his constructed language Quenya (the Elvish tongue of Tolkien's The Lord of the Rings). It is supposed to convey the idea of being related to something. It is not clear if it is strictly used with prepositions, transitive verbs, intransitive verbs, or if it has a general application.
One possible use might be as a translation for the prepositions "respecting", "regarding", or "about" (or "on" when used in an abstract sense). For example, if translating "he told me about the invasion" into Quenya, the Quenya word for "invasion" might appear in the dedative case. This theory also makes sense considering that none of the other cases seem to translate the above prepositions quite satisfactorily.
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