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meter comparison table
Subject is an acronym for has definition has historical origin has symbol has approval agency is a kind of has approval date is an instance of is a unit of has consequence
base SI unitSyteme Internationalea unit assumed to be mutually independent from which all other units are derived   SI unit    
length unit     unit  length 
meterSyteme Internationalelength of the path travelled by light in vacuum during a time interval of 1/299 792 458 of a secondchosen in 1791 by the French Academy of Sciences as 10-7 of the length of the meridian through Paris from pole to the equatorm11th CGPM 1960base SI unitlengthfixes the speed of light in vacuum at exactly 299792458 m·s-1

Next base SI unitmole    Upbase SI unit, length unit    Previous base SI unitkilogram