Englishfor English speakers
per
Preposition
—
for each; during each
Double rooms with full breakfast are £40 per person per night.
unit
Noun
—
One of a measure of something; the amount of something that is counted as "one".
Measure five units to the left.
$4 is the unit price.
A pound is a useful unit for thinking about amounts of butter.
—
Form of measurement.
I prefer metric units.
—
Item, used when no other word for something exists.
He set up the A/C unit.