A metronome is a device which is used to indicate how quickly a piece of music should be played.It can be adjusted to make regular sounds at different speeds.
metronome in British English
(ˈmɛtrəˌnəʊm)
noun
a mechanical device which indicates the exact tempo of a piece of music by producing a clicking sound from a pendulum with an adjustable period of swing
Derived forms
metronomic (ˌmɛtrəˈnɒmɪk) or obsolete metronomical (ˌmɛtrəˈnɒmɪkəl)
adjective
Word origin
C19: from Greek metron measure + nomos rule, law
metronome in American English
(ˈmɛtrəˌnoʊm)
noun
1.
a clockwork device with an inverted pendulum that beats time at a rate determined by the position of a sliding weight on the pendulum: it is used esp. to help a person maintain regular tempo in practicing on the piano, etc.
2.
an electrical device that produces an intermittent sound or flashing light, for similar use