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English definition of “per”

per

preposition       strong /pɜːr/ weak /r/
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 preposition from the Cambridge Business English Dictionary © Cambridge University Press)
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