Learner's definition of PER
1 : for each
The pay is $12 per hour. [=for every hour you work, you will be paid $12]
The tickets are $25 per person. [=each ticket costs $25]
The speed limit is 35 miles per hour.
The car gets 32 miles per gallon.
He averages 15 points per game.
2 somewhat formal : as directed by or stated in
Per your advice, I accepted their offer.
The work was done as per [=according to] your instructions.
As per usual [=as usual], I paid for our meal. [=I paid for our meal, which is what I usually do]