per for learners of EnglishPowered by COBUILD (pɜːʳ)
You use per to express rates and ratios. For example, if something costs £50 per year, you must pay £50 each year for it. If a vehicle is travelling at 40 miles perhour, it travels 40 miles each hour. ⇒ Social Security refused to pay her more than £17 per week. ⇒ Buses and trains use much less fuel per person than cars.