A tool or device used for a particular purpose, especially for making music, doing scientific work, or performing delicate tasks.
From Latin 'instrumentum' meaning 'tool, apparatus, equipment', from 'instruere' (to build, arrange, prepare). It came into English via Old French.
An instrument isn’t just any object—it’s a body extender. A microscope extends your eyes, a violin extends your hands and ears, and scientific instruments extend what humans can even imagine measuring.
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