The difference between Arrange and Instrument
When used as verbs, arrange means to set up, whereas instrument means to apply measuring devices.
Instrument is also noun with the meaning: a device used to produce music.
check bellow for the other definitions of Arrange and Instrument
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Arrange as a verb (transitive):
To set up; to organize; to put into an orderly sequence or arrangement.
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Arrange as a verb (transitive, intransitive):
To plan; to prepare in advance.
Examples:
"to arrange to meet;   to arrange for supper"
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Arrange as a verb (music, transitive, intransitive):
To prepare and adapt an already-written composition for presentation in other than its original form.
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Instrument as a noun:
A device used to produce music.
Examples:
"The violinist was a master of her instrument."
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Instrument as a noun:
A means or agency for achieving an effect.
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Instrument as a noun:
A measuring or displaying device.
Examples:
"The instrument detected an increase in radioactivity."
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Instrument as a noun:
A tool, implement used for manipulation or measurement.
Examples:
"The dentist set down his tray of instruments."
"The scientist recorded the temperature with a thermometer but wished he had a more accurate instrument."
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Instrument as a noun (legal):
A legal document, such as a contract, deed, trust, mortgage, power, indenture, or will.
Examples:
"A bond indenture is the instrument that gives a bond its value."
"Negotiable instruments are the foundation of the debt markets."
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Instrument as a noun (figuratively):
A person used as a mere tool for achieving a goal.
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Instrument as a verb (transitive):
To apply measuring devices.
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Instrument as a verb (transitive):
To devise, conceive, cook up, plan.
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Instrument as a verb:
To perform upon an instrument; to prepare for an instrument.
Examples:
"a sonata instrumented for orchestra"