average speed
Americannoun
Usage
What is average speed? Average speed is calculated by dividing the total distance that something has traveled by the total amount of time it took it to travel that distance. Speed is how fast something is going at a particular moment. Average speed measures the average rate of speed over the extent of a trip. Average speed is usually applied to vehicles like cars, trains, and airplanes. It is often measured in miles per hour (mph) or kilometers per hour (kph). Average speed is used in all kinds of fields, including physics, astronomy, and transportation.
Etymology
Origin of average speed
First recorded in 1820–30
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
After separating from the glacier, the berg moved down Petermann Fjord toward Nares Strait at an average speed of about 3 kilometers per day during its first week.
From Science Daily ● Sep. 4, 2026
The kid known for his electric speed ranks only ninth in total sprints on his own team and his average speed has been below his teammate Aymeric Laporte’s—even though Laporte is a central defender.
From The Wall Street Journal ● Jul. 14, 2026
On the first day at Lord's, Robinson's average speed was 80.3mph, the slowest of the eight seamers on show – including injured New Zealander Matt Henry.
From BBC ● Jun. 4, 2026
"I was scared out of my wits," said Austria's long-retired Fritz Strobl of his record-setting Kitzbuehel descent in 1min 51.58sec in 1997 -- his average speed was an astonishing 106.9km/h.
From Barron's ● Jan. 21, 2026
The average speed of trains was fifteen to twenty miles per hour.
From "Lincoln's Last Days: The Shocking Assassination that Changed America Forever" by Bill O'Reilly
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
