Definition of “per” - English Dictionary

“per” in British English

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uk strong /pɜːr/ weak /r/ us /pɝː/ //

A2 used when expressing rates, prices, or measurements to mean "for each":

The meal will cost $20 per person.
The car was travelling at 70 miles per hour (70 mph).
There are more cafés per square mile here than anywhere else in the country.
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(Definition of “per” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“per” in American English

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us /pɜr, pər/

for each:

The speed limit is 55 miles per hour.
This dish is 225 calories per serving.

(Definition of “per” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“per” in Business English

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uk strong /pɜːr/ uk weak /r/ us

used when talking about prices, rates, etc. to mean the amount for each one:

per day/hour/month, etc. Property prices in the area have increased by an average of 20% per year over the last three years.
The group posted earnings per share of 55.4p in the second quarter.
per head/person Tickets cost $50 per person.
per litre/million/minute
as per sth formal

according to something:

as per your instructions/letter/request The policy was not terminated as per your request.

(Definition of “per” from the Cambridge Business English Dictionary © Cambridge University Press)