Prolative case
From Freepedia
The prolative 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").
