Prolative case
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The prolative case (also vialis case) is a declension of a noun or pronoun that has the basic meaning of "by way of". The prolative is widely used in Estonian.
In the Finnish language, it has a highly restricted, almost fossilized meaning "by (medium of transaction)". For example, "postitse" ("by post"), "puhelimitse" ("by phone"), "meritse" ("by sea"), "netitse" ("over the Internet"). The prolative is considered more to be an adposition by some Finnish grammarians as a result of the fact that it does not show agreement on adjectives like the other Finnish cases.
The vialis case in Eskimo-Aleut languages has a similar interpretation, used to express movement using a surface or way. For example, by way of or through the house.[citation needed]