Instrumental case

In the Slavic and some other languages including Old English, the instrumental case has the basic meaning of 'being used as an instrument (mean, tool) to achieve/accomplish something (an action specified by a verb)'. The instrument can be either some physical object, but also the abstract concept, too.

Sources

• Instrumental Case in Tamil language: http://ccat.sas.upenn.edu/plc/tamilweb/book/chapter2/node24.html
• The Instrumental Case in Russian language: http://www.du.edu/langlit/russian/instr.htm
• What is instrumental case?: http://www.sil.org/linguistics/GlossaryOfLinguisticTerms/WhatIsInstrumentalCase.htm
• Dictionary.com: http://dictionary.reference.com/search?q=instrumental%20case
• Prepositions Governing the Instrumental Case in Russian language: http://www.departments.bucknell.edu/russian/language/prepins.html