
1) Device 2) Helpful 3) Useful
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https://www.crosswordclues.com/clue/instrumental

1) Helpful 2) Implemental 3) Key 4) Ministerial
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https://www.crosswordclues.com/clue/instrumental

An instrumental is a musical composition or recording without lyrics, or singing, although it might include some inarticulate vocal input; the music is primarily or exclusively produced by musical instruments. In a song that is otherwise sung, a section not sung but played with instruments can be called an instrumental interlude. If the instrument...
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http://en.wikipedia.org/wiki/Instrumental

indicating means by which
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http://phrontistery.info/i.html

• (a.) Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; as, he was instrumental in conducting the business. • (a.) Applied to a case expressing means or agency; as, the instrumental case. This is found in Sanskrit as a separate case, but in Greek it was merged into the dative, and in ...
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http://thinkexist.com/dictionary/meaning/instrumental/
[Adjective] Playing an important part in making something happen. Or played by musical instruments without voice accompaniment.
Example: Annie was instrumental in getting Tom and Jade together.
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http://www.bbc.co.uk/skillswise/glossary/

1. Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; as, he was instrumental in conducting the business. 'The head is not more native to the heart, The hand more instrumental to the mouth.' (Shak) ... 2. Pertaining to, made by, or prepared for, an instrument, especially. A musical instrument; as...
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http://www.encyclo.co.uk/local/20973
In`stru·men'tal adjective [ Confer French
instrumental .]
1. Acting as an instrument; serving as a means; contributing to promote; conductive; helpful; serviceable; as, he was
instrumental in conducting the business. « The head is not more native to the heart, The hand more ...
Found on
http://www.encyclo.co.uk/webster/I/72

Unlike a song, an instrumental is a piece of music without any accompanying lyrics or vocal part. In popular music, an instrumental may include vocal sounds, but not lyrics.
Found on
http://www.songstuff.com/glossary/I

[
adj] - relating to or designed for or performed on musical instruments
Found on
http://www.webdictionary.co.uk/definition.php?query=instrumental

using instruments only, with no words.
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https://education.ket.org/resources/music-glossary/
adjective relating to or designed for or performed on musical instruments; `instrumental compositions`; `an instrumental ensemble`
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https://www.encyclo.co.uk/local/20974

played on instruments, without vocals - There's a long instrumental section in the middle of the song.
Found on
https://www.englishclub.com/vocabulary/music-vocabulary.htm

serving or acting as an instrument or means; useful; helpful. · performed on or written for a musical instrument or instruments: instrumental music. · 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 ...
Found on
https://www.infoplease.com/dictionary/instrumental

serving or acting as a means or aid
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https://www.vocabulary.com/lists/265058
No exact match found.