average speed
B1Neutral, common in technical, educational, and everyday contexts.
Definition
Meaning
The total distance travelled divided by the total time taken for a journey or period of movement.
A statistical measure representing the mean rate of motion; can be used metaphorically to describe a typical pace or rate of progress in non-physical contexts.
Linguistics
Semantic Notes
While 'average' can imply 'mediocre', in this compound it is a technical term for the arithmetic mean. It is contrasted with 'instantaneous speed'.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. 'Average' pronunciation differs slightly. Concept is taught identically in maths/physics.
Connotations
Identical technical meaning. In casual UK use, might be heard more in driving contexts (e.g., 'average speed cameras').
Frequency
Equally common in both varieties.
Vocabulary
Collocations
Grammar
Valency Patterns
The average speed of [NOUN] is [NUMBER]to calculate/measure the average speed of [NOUN] over [DISTANCE/TIME]to travel at an average speed of [NUMBER]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “To be up to speed (idiomatically related but not the same)”
Usage
Context Usage
Business
"The average speed of our delivery service has improved by 15% this quarter."
Academic
"The experiment required calculating the average speed of the reaction front."
Everyday
"We drove at an average speed of 70 miles per hour on the motorway."
Technical
"The particle's average speed was derived by integrating its velocity function over the interval."
Examples
By Part of Speech
verb
British English
- We averaged 50 mph along the A1.
- The cyclist averaged a speed of 25 kph over the course.
American English
- The truck averaged 65 mph across Texas.
- She averaged a speed of 7 minutes per mile.
adverb
British English
- (Not standardly used as an adverb; 'on average' is used instead.)
American English
- (Not standardly used as an adverb; 'on average' is used instead.)
adjective
British English
- The average-speed camera network is expanding.
- They published the average-speed data.
American English
- He received an average-speed ticket from a camera system.
- Check the average-speed calculation.
Examples
By CEFR Level
- My average speed on my bike is 15 kilometres per hour.
- The car's average speed was low because of the traffic.
- To find the average speed, you divide the total distance by the total time.
- The train's average speed between London and Edinburgh is about 100 mph.
- Despite a high top speed, his average speed over the lap was compromised by slow corners.
- The study compared the average speed of information processing in different age groups.
- The algorithm optimises the route not for shortest distance, but for highest sustainable average speed.
- Fluctuations in instantaneous velocity have little effect on the time-averaged speed over a sufficiently long period.
Learning
Memory Aids
Mnemonic
Think of AVErAGE SPEED: All Vehicle's Entire Route Added Gives Equals Sum of Path's Entire Elapsed Distance. (Total Distance / Total Time).
Conceptual Metaphor
PROGRESS IS MOTION ALONG A PATH; A TYPICAL RATE IS THE AVERAGE SPEED.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating 'average' as 'средний' with negative connotation of mediocrity. It is neutral 'средняя скорость'.
- Do not confuse with 'мгновенная скорость' (instantaneous speed).
- Word order: English uses noun-noun compound 'average speed', not adjectival phrase like 'speed average'.
Common Mistakes
- Using 'medium speed' instead of 'average speed'.
- Confusing 'average speed' (scalar) with 'average velocity' (vector).
- Incorrectly calculating it by averaging several different speeds without weighting for time.
Practice
Quiz
What is the correct formula for average speed?
FAQ
Frequently Asked Questions
Yes, in most common contexts they are identical, referring to the arithmetic mean of total distance over total time. In specialised statistics, 'mean' could refer to other types of averages, but for 'speed', it's synonymous.
Yes, if an object returns to its starting point, the total displacement is zero, but the total distance is not. Average speed (distance/time) is positive. Average velocity (displacement/time) can be zero. For average speed to be zero, no distance can have been covered (total distance = 0).
Average speed gives a single figure for an entire journey. Instantaneous speed is the speed at one specific moment in time, like what a speedometer shows.
You calculate 'the average speed OF a car'. You travel 'AT an average speed of 50 mph'. The preposition depends on the verb: 'calculate/measure/find the average speed of [noun]', but 'move/travel/drive at an average speed of [number]'.