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[in-struh-muh nt] /ˈɪn strə mənt/
a mechanical tool or implement, especially one used for delicate or precision work:
surgical instruments.
a contrivance or apparatus for producing musical sounds:
a stringed instrument.
a means by which something is effected or done; agency:
an instrument of government.
a device for measuring the present value of a quantity under observation.
a mechanical or electronic measuring device, especially one used in navigation:
landing a plane by instruments.
a formal legal document, as a draft or bond:
negotiable instruments.
a person used by another merely as a means to some private end; tool or dupe.
verb (used with object)
to equip with instruments, as a machine or manufacturing process:
to instrument a space vehicle.
to arrange a composition for musical instruments; orchestrate.
Origin of instrument
1250-1300; Middle English < Latin instrūmentum equip-ment, equivalent to instrū-, stem of instruere to equip (see instruct) + -mentum -ment; see instruct
Related forms
underinstrument, noun
1. See tool. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for instruments
  • Even the two organs in the choir loft are decorated, with angels playing instruments.
  • Cook boxed up his expedition records, except for his diary, and his instruments.
  • It is marvellous how quickly an experienced hand can clear the ground in a forest with one of these instruments.
  • When used as instruments of beauty, they may add to the rhythmic structure of a poem the element of melody.
  • The current students' obsession with grading can be solved with numerous instruments--feedback can be numeric or commentary.
  • From time to time, exhibits of torture instruments go on tour.
  • They rigged up their own instruments, such as a wooden plank outfitted with a single string and two pickups.
  • Musical instruments don't use much timber, but when they do, it's usually prized wood.
  • Spacecraft and the instruments they carry must become completely autonomous.
  • Change the beat and the instruments around the voice, and her songs could work anywhere.
British Dictionary definitions for instruments


noun (ˈɪnstrəmənt)
a mechanical implement or tool, esp one used for precision work: surgical instrument
(music) any of various contrivances or mechanisms that can be played to produce musical tones or sounds
an important factor or agency in something: her evidence was an instrument in his arrest
(informal) a person used by another to gain an end; dupe; tool
a measuring device, such as a pressure gauge or ammeter
  1. a device or system for use in navigation or control, esp of aircraft
  2. (as modifier): instrument landing
a formal legal document
verb (transitive) (ˈɪnstrəˌmɛnt)
another word for orchestrate (sense 1)
to equip with instruments
Word Origin
C13: from Latin instrūmentum tool, equipment, from instruere to erect, furnish; see instruct
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for instruments



late 13c., "musical instrument," from Old French instrument "means, device; musical instrument" (14c., earlier estrument, 13c.) and directly from Latin instrumentem "a tool, apparatus, furniture, dress, document," from instruere "arrange, furnish" (see instruct). Meaning "tool, implement, utensil" is early 14c. in English; meaning "written document by which formal expression is given to a legal act" is from early 15c.

Online Etymology Dictionary, © 2010 Douglas Harper
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instruments in Medicine

instrument in·stru·ment (ĭn'strə-mənt)
A tool or implement, as for surgery.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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