This is the 1362nd most frequent Polish word.
promila
"Promila" in Polish means "per mille" or "one-tenth of a percent (0.1%)."
The word 'promila' here refers to the unit 'permille', used to describe the concentration of alcohol in blood.
W wyniku kontroli drogowej okazało się, że kierowca miał we krwi pół promila alkoholu.
As a result of a traffic control, it turned out the driver had half a permille of alcohol in his blood.
In this sentence, 'promili' indicates a very small statistical likelihood, emphasizing rarity.
Szansa na wygraną w tej loterii wynosi zaledwie kilka promili.
The chance of winning in this lottery is just a few permille.
Here 'promili' is used in a statistical context to quantify a proportional increase.