Instrumental case

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

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