per
/pɜː(ɹ)//pɝ/preposition
Definitions
For each.
Example: $2.50 per dozen
To each, in each (used in expressing ratios of units).
Example: 100 centimeters per meter
By the, by means of the, via the, through the.
Example: Introduce the endoscope per nasum.
In accordance with.
Example: I parked my car at the curb per your request.