- The SI unit of distance. It is defined as the distance that makes the speed of light in a vacuum exactly 299,792,458 meters per second. Thus, a meter is the distance traveled by light in a vacuum during a time interval of 1/299792458 second. Its abbreviation is m. Also spelled metre.
- An instrument or device which is utilized to measure, and usually indicate, a physical quantity or other value. There are numerous examples, including ammeters, absorptiometers, barometers, chronometers, dB meters, galvanometers, and voltmeters.
- symbol m
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