instrumental

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instrumental,

in the grammar of certain languages (e.g., Russian), the casecase,
in language, one of the several possible forms of a given noun, pronoun, or adjective that indicates its grammatical function (see inflection); in inflected languages it is usually indicated by a series of suffixes attached to a stem, as in Latin amicus,
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 referring to means or instrument. The Latin ablativeablative
[Lat.,=carrying off], in Latin grammar, the case used in a number of circumstances, particularly with certain prepositions and in locating place or time. The term is also used in the grammar of some languages (e.g., Sanskrit, Finnish) for a case of separation, e.g.
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 may in some instances be termed instrumental.

instrumental

a piece of music composed for instruments rather than for voices