Wiktionary
adverbial case
n. (context grammar English) a noun case in the Abkhaz, Georgian, and Udmurt languages
Wikipedia
Adverbial case
The adverbial case ( abbreviated ) is a noun case in the Abkhaz language and Georgian language that has a function similar to the translative and essive cases in Finnic languages. It is also featured in the Udmurt language. The term is sometimes used to refer to the ablative case in other languages.