Prolative case

In Finnish, the prolative case follows an established application in a number of fossilized expressions to indicate "by (medium of transaction)".

[3] Examples would be "postitse" ("by post"), "puhelimitse" ("by telephone"), "meritse" ("by sea"), "netitse" ("over the Internet").

[4] This claim is not true, however, because an adjective will agree with the prolative: "Hän hoiti asian pitkitse kirjeitse" ("He/she dealt with the matter by way of a long letter").

For example, in the Greenlandic language umiarsuakkut 'by ship'[5] or in Central Alaskan Yup'ik kuigkun 'by river' or ikamrakun 'by sled'.

Basque grammars frequently list the nortzat / nortako case (suffix -tzat or -tako) as "prolative" (prolatiboa).