Mile (mi)
Definition: A mile (symbol: mi) is a unit of length equal to exactly 1,609.344 meters or 5,280 feet. It is used in the imperial and US customary measurement systems.
History/origin: The mile originates from the Roman mille passuum (a thousand paces), which was approximately 1,480 meters. Over time the English mile evolved to its current standardized length, fixed at 1,609.344 m in 1959 alongside the international yard and foot agreement.
Current use: Miles are used for road distances in the United States, United Kingdom, and a handful of other countries. Speed limits, odometers, and road signs in these regions display distances in miles rather than kilometers.


