from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An exceptionally precise timepiece.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A device for measuring time, such as a watch or clock
from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for measuring time; a timekeeper.
- n. A portable timekeeper, with a heavy compensation balance, and usually beating half seconds; -- intended to keep time with great accuracy for use an astronomical observations, in determining longitude, etc.
- n. A metronome.
from The Century Dictionary and Cyclopedia
- n. Any instrument that measures time, or divides time into equal portions, or is used for that purpose, as a clock, watch, or dial.
- n. Specifically, a time-keeper of great accuracy designed to be used for determining the longitude at sea, or for any other purpose where a very exact measurement of time is required.
- n. An instrument intended to set the pace and rhythm for a piece of music; a metronome.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. an accurate clock (especially used in navigation)
From Ancient Greek χρόνος (chronos, "time") + μέτρον (metron, "measure") (Wiktionary)