n. 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 GNU version of the Collaborative International Dictionary of English
n. An instrument consisting of a short pendulum with a sliding weight. It is set in motion by clockwork, and serves to measure time in music.
The Century Dictionary and Cyclopedia
n. A mechanical contrivance for marking time, especially as an aid in musical study or performance.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. clicking pendulum indicates the exact tempo of a piece of music
Word Usage
"Along with the metronome, which is a key tool in ChiRunning and ChiWalking, the other important accessory is a good watch."