Metronome

//ˈmɛt.ɹəˌnoʊm// noun

Definitions

Noun
  1. 1
    A device, containing an inverted pendulum, used to mark time by means of regular ticks at adjustable intervals; an electronic equivalent that emits flashes.

    "The etudes with metronome markings should be played in tempo, all others should be considered rubato."

  2. 2
    clicking pendulum indicates the exact tempo of a piece of music wordnet

Etymology

Coined in English from Ancient Greek μέτρον (métron, “measure”) + νόμος (nómos, “regulation, law”).

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