Superessive case
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The Superessive case is a grammatical declension indicating location on top of something or on the surface of something. Its name comes from Latin supersum, superesse: to be over and above.
While most languages communicate this concept through the use of prepositions, there are some (most notably the family of Finno-Ugric languages which includes Finnish and Hungarian) which make use of cases for this grammatical structure.
An example in Hungarian: a könyveken means "on the books", literally "the books-on".
In Finnish, superessive is used only with certain pronouns.