This is the 328th most frequent Finnish word.
puoli
"Puoli" means "half" in English.
In this context, 'puoli' is used as a noun to indicate 'half' of the quantity.
Otan puoli lasillista vettä.
I take a half glass of water.
Here, 'puoli' is used to denote a time duration, specifically 'half' of an hour.
Hän asuu puoli tuntia koulusta.
He lives half an hour from the school.
In this case, 'puoli' is employed in expressing time, indicating 'half past' a given hour.