The metre or meter (from the Greek μέτρον /΄metron/)'s a unit of proper length. It's the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes. Historically, the metre was defined by the French Academy of Sciences as the length between two marks on a platinum-iridium bar, which was designed to represent of the distance from the equator to the north pole through Paris.… (More on Millimeters)