Centimeter

Definition : A centimeter (cm) is a unit of length in the metric system, equal to one-hundredth of a meter.

Origin : The term “centimeter” comes from the Latin centum (meaning “hundred”) and the Greek metron (meaning “measure”). The metric system, including the centimeter, was introduced in France in 1795 during the French Revolution.

Meter

Definition : A meter (m) is the base unit of length in the metric system, defined as the distance light travels in a vacuum in 1/299,792,458 of a second.

Origin : The word “meter” comes from the Greek metron, meaning “measure.” The meter was first established in 1791 by the French Academy of Sciences as one ten-millionth of the distance from the Earth’s equator to the North Pole. It has since been redefined based on the speed of light.