in·stru·ment
ˈin(t)-strə-mənt
1
: a device used to produce music
also
: a singing voice
2
: implement
especially
: one designed for precision work
3
a
: a measuring device for determining the present value of a quantity under observation
b
: an electrical or mechanical device used in navigating an airplane
especially
: such a device used as the sole means of navigating
4
5
: a formal legal document (such as a deed, bond, or agreement)
in·stru·ment
ˈin(t)-strə-ˌment
instrumented; instrumenting; instruments
1
: to address a legal instrument to
2
: to score for musical performance : orchestrate
3
: to equip with instruments especially for measuring and recording data
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Merriam-Webster unabridged
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