serving or acting as an instrument or means; useful; helpful.
performed on or written for a musical instrument or instruments:
of or pertaining to an instrument or tool.
(in certain inflected languages, as Old English and Russian) noting or pertaining to a case having as its distinctive function the indication of means or agency, as Old English beseah blīthe andweitan “looked with a happy countenance.”.
noting the affix or other element characteristic of this case, or a word containing such an element.
similar to such a case form in function or meaning, as the Latin instrumental ablative, gladiō, “by means of a sword.”.
(in case grammar) pertaining to the semantic role of a noun phrase that indicates the inanimate, nonvolitional, immediate cause of the action expressed by a verb, as the rock in The rock broke the window or in I broke the window with the rock.
the instrumental case.
a word in the instrumental case.
a construction of similar meaning.
a musical composition played by an instrument or a group of instruments.
British Dictionary definitions for un instrumental
serving as a means or influence; helpful
of, relating to, or characterized by an instrument or instruments
played by or composed for musical instruments
(grammar) denoting a case of nouns, etc, in certain inflected languages, indicating the instrument used in performing an action, usually translated into English using the prepositions with or by means of
a piece of music composed for instruments rather than for voices